If I understand correctly, you don't just need some slapstick stuff where someone falls of a ladder and makes a dumb face, right? And you probably won't need scenes from zombie or splatter movies either.
Dialogue and that is ok? Or will you add music to your video?
Because most of the good and timeless scenes have dialogue in them or have music of their own.
It's kinda hard to remember all the countless funny scenes I've seen so far.

There are some that come to my mind now
The "I feel pretty" scene from Anger Management: Jack Nicholson and Adam Sandler sit in the car in the middle of traffic on a bridge and Nicholson ****** Sandler to sing "I feel pretty". Usually not much of an Adam Sandler fan, but that scene was hilarious.
The "motel room rant" from Planes, Traines and Automobiles: Steve Martin goes on an endless rant about the annoying habits and the relentless blabbering of his travelling companion John Candy. Was kind of a mistake watching that with my *******. I almost pissed myself just because he was laughing so hard.
Several scenes from Guest House Paradiso, for example "the kitchen beatdown" or the "candle in the eye" scenes.
The "clatu verata n...*cough cough*" scene from Army of Darkness.
The "stoning" scene from Life of Brian ("Jehovah! Jehovah!"

).
The "it's just a fleshwound" scene from Monty Python and the Holy Grail. (King Arthur: Look, you stupid bastard. You've got no arms left!; Black Knight: Yes I have!; King Arthur: *Look*!; Black Knight: It's just a flesh wound. :rofl: )
Perhaps the "food on the floor" scene in Matchstick Men or the "footmassage conversation" scene in Pulp Fiction.
And certainly a lot of scenes from Bad Santa, Dead Like Me, Tampopo, Tremors, Ghostbusters, Shaun of the Dead (there are non-gory ones), As Good As It Gets (Receptionist: "How do you write women so well?"; Melvin Udall: "I think of a man, and I take away reason and accountability."

), 30 Rock, How I Met Your ****** and many more.