(Something about people trying desperately NOT TO LAUGH that inspires peals of helpless laughter. Especially if those people are Roman Centurions.)
Remember the episode of * Mary Tyler Moore * with Mary at the funeral of Chuckles the Clown?
"
"He has a wife, you know. Do you know what she’s called? She’scalled Incontinentia.
Incontinentia Buttocks."
And let’s not forget:
“Blessed are the cheesmakers.
What’s so special about the cheesemakers?
It’s allegorical. It refers to all manufacturers of dairy products.”
We LOVE this movie!
You will find yourself in gladiator school very quickly with wotten behavior like that!
Jackie Treehorn treats objects like women, man!
Not a movie, but absolutely break up every time.
“What. . . does. . . a. . . .yellooooowwww. . . light. . . .mean?”
Back to movies. In Little Miss Sunshine, the extended scene with the stuck horn on the VW bus. I’ve never laughed so hard in a movie.
Something About Mary had some pretty funny goop in her hair. Plus that dog on the top of Ben Stiller’s car, and those old jiggly tits in the binoculars… Franks and beans!
Not mentioned yet - just about every single line in ***Best in Show ***does it for me, from “We met at Starbucks” (Parker Posey at her funniest) to the Anna Nicole parody “We both love soup”, to everything that came out of Fred Willard’s mouth (as the dog show commentator).
Like another poster mentioned - just looking up the clips on YouTube had me in stitches.
Slow down! 
Another sitcom, guest starring David Cross.
Donnie: Donnie wants a kiss.
Maya: Oh, that’s… sweet.
Donnie: Kissy?
Maya: Oh, why not? [kisses Donnie on the cheek]
Donnie: No, Donnie want a kiss like on Showtime.
Donnie: Donnie has secret. Promise not to tell anybody?
Maya: I promise.
Donnie: You swear? Cross your heart?
Maya: Cross my heart.
Donnie: On a stalk of bible books?
Maya: I swear.
Donnie: [normal voice] Okay, here’s the thing. I’m not really slow. I just faked falling off that tree, and now they wait on me hand and foot. It is the sweetest scam in the world.
Entire episode here: https://youtu.be/zE3Rl8EIZ0k
In 1933, my wife’s aunt was walking on the MGM lot, heading either to or from a screen test, when (according to her later retelling) a production assistant or something grabbed her, brought her into a sound stage, and told her to go through a door and ask for her aunt Minnie.
Here is the result.
It counts as a funny scene in a movie, IMHO.
The scene from Monty Python’s Life of Brian where the Roman Centurion (John Cleese) catches Brian painting graffiti and bizarrely decides to give him a lesson in Latin grammar: Life Of Brian Latin Lessons - YouTube (3:13)
“The red zone is for immediate loading and unloading of passengers only. There is no stopping in the white zone.”
“No, the white zone is for loading of passengers and there is no stopping in a red zone.”
“Listen Betty, don’t start up with your white zone shit again.”
“Excuse me, stewardess? I speak jive.”
“Captain, how soon can you land?”
“I can’t tell.”
“You can tell me, I’m a doctor.”
“No, I mean I’m just not sure.”
“Can’t you take a guess?”
“Well…not for another two hours.”
“You can’t take a guess for another two hours?”
The whipping scene in Dirty Rotten Scoundrels (1988):
“Oh look doctor, he’s so happy he’s crying!”
Aye, I love that scene.
This is absolutely true and is the only thing keeping this $5 DVD in my collection. The movie sucks, but the opening scene is GOLD! Sarah Silverman’s best role!
‘Didn’t you guys ever *watch *the show?’
‘This episode was badly written!’
and the ultimate makes me laugh every time,
‘That was a hell of a thing.’
Ah, Bo, if I wasn’t a straight male, I’d crush on you hard for getting my sense of humor.
Animal House, although definitely in the juvenile-level humor, can still make me laugh.
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The ‘ROTC training and Golf scene’
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The horse in the Office “Holy Shit!!”
*“Can I have 10,000 marbles, please?”
- “Was it over when the Germans bombed Pearl Harbor?”
“The Germans?”
“Forget it, he’s rolling.”
A couple of Peter Sellers ones for me:
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The Pink Panther Strikes Again - during the interrogation scene when the Inspector uses the parallel bars and falls down the stairs, plus when he walks into a dark room and switches the treadmill on instead of the lights
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The Party - the whole “birdy num num” scene, plus when he shakes hands with the cowboy “I would have been dissapointed if you had not crushed my hand!”
Rat Race cracks me up beginning-to-end…a few samples…
The (Klaus) Barbie Museum, all the way through until where John Lovitz ends up looking like Hitler speaking something foreign-sounding in front of a gathering of WWII veterans.
“You…Should…Have…Bought…A…Squirrel.”
The cow hitting the windshield of the Lucy bus.
“Look! A dreefter! Let’s kill him and take his heart!”
“Listen, lady, we’re not crazy. We came in the rocket car…”
The various background bets that the rich people are engaged in.
“Is anybody hiding there in the dark?”