I can't imagine a film buff who has never heard of Grease, even if they haven't seen it.
I've seen this film countless times and it's still as fun now as it was back then.
I said in my review for Sweeney Todd that a musical needs something to draw my attention. Sweeney had a macabre storyline, Enchanted had the parody nature, Grease has the lyrics. After hearing them for the first time without giving them too much attention, they sound lovely and sweet. Read the lyrics to some songs, however, and you start laughing at how they were able to get past censors and morally uptight people (I'm Sandra Dee and Grease Lightnin' are the best examples here).
It's not just the lyrics, the subplots are a little more adult too. What with discussions of sex and possible pregnancies and you have a clever film masquerading as something a little more innocent.
The characters in this film are strong too.
Olivia Newton-John is utterly devine as Sandy and her song Hopelessly Devoted To You's power has not dulled even in the modern era.
John Travolta gives one of the best performances of his career as the conflicted Danny. He's ready to shake off his old life of man-about-town but his friends still see him as their idol and in that, he is torn. It is that conflict that makes Danny a compassionate character (for the most part). Just imagine what would have happened if the rumored alternate ending had happened. I won't say too much due to how much of a downer it is but even I wouldn't have chosen that and I'm into darker material.
If I have one strike against the film, it's the ending. While Sandy and Danny do make a good couple, it takes Sandy changing her style to be more like Danny for the "happy" ending to occur. The implication seems to be "if you love someone, just change everything and don't expect them to do the same for you". Granted, Danny was trying to change for Sandy but there still should have been a compromise. Sandy could have just become a little more carefree while Danny could have been a little more like a gentleman.
Nonetheless, a powerful musical. Excellent cast and good songs make this a treat.