Of the Marx Brothers scenes I've seen, I've gotta' say my favorite is from the unforgettable duck soup. Everyones going over a map, and discussing the names on it. Watch closely though, if you watch their hands, you'll notice that they spend the entire scene giving the camera the middle finger. A level above, man.
All time favorite scene, I don't know...
probably the entirety of
The Graduate, although, that's really a cop out if there ever was one, so I'll single out
the lobby scene. It's hilarious the way Ben handles himself, when he's talking to Buck Henry...
Are you here for an affair, sir?
Trying to get out of talking to the hosts of the party without having to explain himself...
I'll find your table in a moment. Braddock. Not Braniff? We have a Braniff.
And finally, his meeting with Mrs. Robinson...
The room number, Benjamin. I think you ought to tell me that.
I think what gets me, is that Benjamin is so incredibly nervous, that he's really just reacting to everyone.