Yeah, how can you pick just one. But the one that makes me giggle every single time I think of it is the press conference scream from Rocketman. Never, ever gets old.
I don't think this is the absolute funniest movie scene ever but for some reason the scene in Rounders came to mind where the KGB Russian is taunting Matt Damon and says "I stick it in ya" he makes this clicking noise and does a couple hip thrusts .. Very funny IMO
From The Naked Gun: Frank: What would a man like Savage be doing in the red-light district? Ed: Sex, Frank? Frank: Uh, no thanks, Ed.
Not linking for obvious reasons, but: Planes, Trains, & Automobiles. Steve Martin and the rental car agent.
It's too inappropriate to post any videos about it, but basically the whole first half of Full Metal Jacket.
Maybe not the beat scene...BT the best line I've ever heard! Brock's Best Line Ever: OK in all seriousness the funniest scene in a movie is: Center For Kids Who Can't Read Good - Zoolander: Its just so bad it funny....cracks me up every time I think of it!
Bill Murray Cinderella story from Caddyshack....it's in the hole! There are just too many lines to list!
Somebody may have already put it on here, but the fart scene from Blazing Saddles makes me giggle every time. <iframe width="420" height="315" src="https://www.youtube.com/embed/MDVrmSEZEKg" frameborder="0" allowfullscreen></iframe>