There's a moment in "Anchorman" where the four leads break into song. It's a harmonious version of "Afternoon Delight". And while amusing, it's not particularly funny or contributes much to the overall film. There are many moments like those in "Anchorman" at times making it feel like a thematic episode of "Saturday Night Live". But in the case of this film, it doesn't matter.
What does matter is Will Ferrell. The film revolves around him and exists just to give him moments of wackiness. The rest of the cast is amazing but they are inconsequential to the success of the film. At times their presence is distracting as the film starts to feel like "spot the A-lister". Look, it's Ben Stiller! Tim Robbins! Seth Rogan!
"Anchorman - The Legend of Ron Burgundy"'s script is loaded with silly moments and, what has made it a cult classic, a boatload of inspired lines. " I don't know how to put this but I'm kind of a big deal." "I'm gonna punch you in the ovary, that's what I'm gonna do. A straight shot. Right to the babymaker" among others.
So if you want a goofy smile on your face, turn on "Anchorman" it will deliver silly laughs without taxing the brain.