"The Proton Displacement" is the seventh episode of the seventh season of the American sitcom The Big Bang Theory. The episode first aired on Thursday, November 7, 2013.
Sheldon and Leonard meet Professor Proton (Arthur Jeffries) again, who chooses Leonard to collaborate on his paper instead of Sheldon, which upsets the latter. Sheldon then brings in Bill Nye as his new idol, but is soon ditched.
Sheldon is running around the drug store. Amy remarks that she has never seen him so happy. Leonard explains that it is Restock Your Medicine Cabinet Day at the store. Sheldon sees Professor Proton in the pharmacy line. Sheldon finds it's interesting that he is just standing in line like he wasn't moderately famous thirty-years ago. Sheldon wants to go over and say hello. Leonard feels that they shouldn't bother him. Sheldon is not going to bother him; he is going to talk to him. Leonard quips that he thinks that there is a difference. Sheldon reintroduces himself since he doesn't think that he'll remember him due to his advanced age. Professor Proton does remember him. Sheldon then introduces his girlfriend, Amy. The Professor is surprised at learning that Sheldon has a girlfriend. Amy then shakes his hand and then notes that they have the same orthopedic shoes. She can't believe that she dresses like a celebrity. Professor Proton then understands how he has a girlfriend. Leonard reintroduces himself. He does remember HIS girlfriend, Penny. Sheldon wonders what prescription he was getting filled. Leonard starts to object, when Sheldon say not to tell him. Professor Proton wasn't going to tell him. Sheldon asks if it has to do with difficulty in initiating a stream. Given his age, he says that that is more than a lucky guess. Leonard suggests that he go over and mock the people in the homeopathic medicine aisle. Sheldon replies that he wants to hang out with his friend who he thinks looks happy, but is not.
At the Caltech cafeteria, Howard is talking about the girls' night that Bernadette is having at their place. Raj reluctantly admits that he is going even though they are making jewelry which was his idea. Raj objects that he is very comfortable with his masculinity. Howard asks him how that that is even possible. Leonard then gets an email from Professor Proton. He is working on a paper about nano-vacuum tubes and he wants Leonard to read it. Sheldon figures that the Professor should be asking him. He does have two emails from the Professor asking for Leonard's email address. Howard wonders who would cry over a paper by some old guy who hasn't done any science in decades. Sheldon Cooper DOESN'T cry. Howard agreed and said that he rusts.
Later in apartment 4A, Amy is preparing tea as Sheldon wonders why he ever idolized him since he's just another Hollywood phony. Amy wonders if it is worth getting upset over. Sheldon says that you shouldn't met your heroes and don't peek behind that curtain of fame and celebrity because you see them as they really are, degenerate carnival folk. Amy reminds him that he is just a retired kid's show host. Sheldon replies that that is worse since he uses the sweet candy of science to trick children into loving him. Then he calls him a pervert. Amy then asks Sheldon why he thinks that Arthur didn't want him to read his paper. Sheldon figures that the prescription he picked up at the pharmacy was for coo-coo pills. Amy suggests that he found Sheldon too much. Sheldon demonstrates that he has already mastered the three basic social skills. The coy smile, friendly chuckle and the vocalization of sympathy, "Ahhhh." Amy tries to suggest that Leonard and Arthur may have found him...Annoying, but she can't say it. Sheldon knows she wants to say "annoying", and repetitively demands that Amy call him "annoying" - very annoyingly. Amy leaves without a word. Sheldon then remarks that she can't stand it when he is right.
At Howard and Bernadette's apartment, the jewelry making session is in full swing. Amy is going to feel like a vixen wearing something that doesn't list the medications she is allergic to. Penny has glue all over her hands. Amy wonders if she doesn't know how to use glue because she dropped out of pre-school. Penny agreed, but that was only because she was dating a second grader at the time. Howard comes in and Raj tells him to go ahead and start with the girl jokes. Howard told him to not worry about it since Bernadette told him that it wasn't nice. Howard tells him that he doesn't want to joke about the things he wants to have fu-un with referring to the Cyndi Lauper song. Bernadette is making a necklace. Amy is making a bracelet. Penny is making a mess. Howard suggests that they use his soldering iron to make even cooler stuff. Raj tells him that they are doing fine. The girls want to try it out so Howard goes off to get his equipment while Penny finds a pistachio nut glued to her arm.
Sheldon goes over to Professor Proton's house and knocks on his front door. "Knock. Knock. Knock. Arthur. Knock. Knock. Knock. Arthur. Knock. Knock. Knock. Arthur." Sheldon remarks that he has a door knocker due to being a television star. Arthur wants to know what Sheldon is doing there. He woke him because it is 7:30 in the evening. Sheldon apologizes for not being there earlier because Arthur's home wasn't on his map of Hollywood stars. Sheldon tells him that Amy pointed out that he might have been annoying. Arthur called Amy "a keeper". Sheldon apologizes which Arthur quickly accepts, says good night and tries to close the door. Sheldon also wants to talk about the paper he gave to Leonard who calls it "promising". Sheldon is ready to collaborate with him and that working with "Sheldon Cooper" will be a plus since others think that he is a washed-up has-been or dead. Arthur claims that he should be so lucky and that he would rather stick with Leonard. Sheldon concludes that it is because he is annoying and demands Proton to call him annoying as he had with Amy. Professor Proton eventually does so, and shuts the door at his face. Sheldon then walks away saying how much that hurts.
Another day, Leonard and Professor Proton are in Leonard's lab with Leonard telling him that if people had told him thirty years later he would be working on science with Professor Proton, he would not have believed them. Arthur quips that if people had told him that people would still be calling him Professor Proton at the age of 83, he would not have stopped smoking. Leonard apologizes to Dr. Jeffries and told him how interesting his project was. Sheldon wanders into the lab and tells them what a odd coincidence that they were both there since he is also spending the day with another beloved children's science personality. He introduces his new friend and colleague, Bill Nye, the Science Guy. Sheldon tells Arthur that he replaced him with a newer model. Bill Nye finds it an honor to meet Arthur Jeffries since his show was based on Professor Proton. Arthur snaps as him that that was what he had told his lawyers, implying that they have had a lawsuit concerning the originality of Bill Nye's science show. Leonard apologies to Nye for being drawn into Sheldon's squabble. Nye insists that he was told he would be teaching a class. Sheldon corrects him that he was told that he would be teaching someone a lesson. Sheldon then leaves. Nye expresses an interest in the nano vacuum tube project. Arthur gets angry and says, "Haven't you stolen enough from me? Back off, Bow Tie!"
Amy, Raj and Penny are working on jewelry at Penny's place. Penny shows them some earrings, though she bought them at the Target store for $4.98. Raj is working on a bracelet for his mother who is going through a hard time with his father. He can't stand her voice and wants to rip off his ears and sew them to his eyes so he doesn't have to look at her anymore. Bernadette shows up with Howard and his soldering equipment. He plans to put the "Jew" in "jewelry" night. Bernadette tells him that sure it sounds funnier when he says it. Raj didn't know that he was coming. Howard had had a blast last week so he showed up thinking that they might like to have a man show up. A slightly tipsy Penny laughs and then retreats saying that that is not funny. Howard brought silver, molds and a torch to melt the silver. Penny thinks that that looks like fun. Bernadette suggests that she master glue before she steps up to fire. Amy asks Raj if he wants to make a bracelet for his mother to go along with the necklace. He declines. Howard would do that if his mother had a neck.
Leonard and Arthur continue to working and are about ready to test their equipment. Arthur is so excited that it makes him feels like seventy-five again. Leonard received a picture from Sheldon of him and Bill Nye having smoothies together. Arthur asks why he puts up with Sheldon. Leonard replies that he is his friend. "Why?" Arthur asks. Leonard tells Arthur that he asks really hard questions. Leonard explains that Sheldon is aggravating, however; he is not doing it on purpose. Sheldon is loyal, trustworthy and they have a lot of fun together. Arthur comments that he is describing a dog. Leonard does acknowledge that Sheldon did bite him once. Sheldon is the smartest person Leonard has ever met. He is a little broken, but Sheldon needs him and Leonard needs Sheldon. Arthur then asks why does Leonard need him and Leonard tells him that he just won't let this subject go. Finally, Leonard gets a text from Sheldon saying that he needs a ride home since Bill Nye left him at the smoothie store.
In Apartment 4B, Howard is helping the girls with their handcrafted jewelry. He claims that he can take some of their hair, compress it into a small diamond using a hydraulic press at work and the diamond would contain their very own DNA code. Then he quips that Bernadette's engagement ring came off his mother's back. Bernadette denies it. Raj complains that Howard makes fun of him coming to girls' night and now he is ruining it for everyone. Penny says for him to cool it since he is going to make them hair diamonds. Howard asks Raj what is wrong. Raj tells him that he comes to girls' night so that he can open up about his feelings. Howard replies that he can do that with him. Raj is more comfortable talking to the girls since they don't make fun of him and his feminine activities. Howard apologizes since he didn't know that his joking around hurt. He adds that it was very brave of Raj to tell him. While the girls are watching, Amy comments that Raj and Howard are going to have sex before she and Sheldon ever do.
Later in Apartment 4A, Arthur Jeffries visits Sheldon. Sheldon is surprised that he was there. So was Arthur who started to see a bright white light about the third floor. Sheldon offers to get Leonard, however Arthur came to see Sheldon. Sheldon remarks that if he wants to contact Bill Nye, he can't do it. His former idol is now Bill Nye, the restraining order guy. Arthur asks him to look at his paper and Sheldon tells him that it would be an honor. Then Sheldon adds that he hacked into Arthur's email account and already read it. Arthur asks what he thinks. Sheldon starts with he thinks its pathetic using his birth date as a password. The paper, Sheldon feels, is inspired. Arthur thanks him. Sheldon invites him in for tea, however he has to run. Penny come in, greets him and Arthur changes his mind.
Finally, to show friendship, Raj makes a belt buckle for Howard, which displays a transparent miniature of light saber that can be lit. And he then reveals he also made one for himself, and says they can have a "little sword fights" that have sexual overtones.
Back at Sheldon's apartment, Sheldon is now describing his eighth favorite episode of the Professor Proton series which was the Alka-Seltzer rocket. Arthur is not looking happy. Sheldon remembers that his joke from that episode was "Plop, plop, fizz, fizz, oh what a blastoff it is." Sheldon runs off to get some Alka-Seltzer so they can recreate the experiment. He wants to fire it at Bill Nye's house as long as they stay at least 500 feet away from it per the restraining order. Leonard again apologizes that Sheldon really can't help it. Arthur then asks if Penny has any single grandmothers. Penny does, however; they are married. He then wonders if they are happily married. Penny give him a noncommittal response (come see, come saw) which makes Arthur happier.
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