Whenever I just want a laugh I watch the scene in Rat Race where the air traffic control tower pulls the jeep up the tower to the strains of “Hall of the Mountain King” by Edvard Grieg.
The rest of the movie is somewhat funny but I find this truly hilarious.
The scene from The Pink Panther Strikes Again where Inspector Clouseau has just destroyed a piano…
Mrs. Leverlilly: You’ve ruined that piano!
Clouseau: What is the price of one piano compared to the terrible crime that’s been committed here?
Mrs. Leverlilly: But that’s a priceless Steinway!
Clouseau: Not anymore!
Peter Sellers in The Party. “Birdie Num Num.” Gets me every time.
One of my favorite bits of all time. Tim Conway is a comedy god.
My contribution is from Anchorman, when Ron Burgundy jumps into a bear pit in order to rescue his lady. The first words out of his mouth are, ‘‘I immediately regret this decision!’’
Other than Pythons, I’d say I can watch Dumb & Dumber any time
The whole scene is great but the ending is so over the top but hillarious 
“Put… the candle… back!” Teri Garr’s delivery of that line cracks me up every time.
From* Hot Shots Part Deux:*
Topper Harley (to love interest): Ramada, I want to be with you. I want to hold you. I want meet your parents and pet your dog.
Ramada: My parents are dead Topper, my dog ate them.
Dang! You beat me to it!
“We’re going streaking!”
Old School
“I guess we all sort of stole something”
“No…I stole something else…”
[Cut to scene of them taking the printer out into a field and beating it]
Office Space
“They were both poisoned. I spent the last few years building up an immunity to iocane powder.”
The Princess Bride
“THAT GUN WAS FILLED WITH BLANKS!”
“I DIDN’T EVEN POINT IT AT HIM!”
Animal House
“He slimed me.”
Ghostbusters
“What am I gonna do with 40 subscriptions to Vibe?”
(That was actually my sig here for a while.)
The first line from Alpha literally had me laughing so hard I nearly fell out of my chair. I was having a fit. Shear comic genius.
In the French Bond spoof, OSS 117: Cairo: Nest of Spies, our hero is bedding a beautiful femme fatale. He lays her down on the bed, kissing passionately. The music swells as the camera slowly pans away from them, across the room… and onto a mirror in which we can see 117 frantically dry humping the woman’s leg as he fumbles with his fly. The camera does a double take, then quickly looks at the floor.
Two lines from one of the greatest little seen comedies of all time: Rustler’s Rhapsody:
“Roots beginning to work.”
“You ride alone? You’re the most un-alone guy I’ve ever met.”
From Dumb & Dumber:
“we got no food- we got no jobs- our pets’ heads are falling off!”
“Does your dog bite?”
The Big Boy scene in The Emperor’s New Groove. I’m not a big Disney fan in general, but they really knocked it out of the park with that one.
Crude perhaps, but…
The One-Armed Violinist and the “Volare” scenes from Hollywood Knights.
The gold standard for athletes performing in a movie.
I speak jive.
From The Cowboy Way
Chango(Luis Guzman): What’s a baby cow gonna do to me?
[Sonny shrugs and pulls down Chango’s pants]
Chango: Hey come on man!, what you doing?
Sonny(Kiefer Sutherland): I am embarrassed, our friend here isn’t wearing any underpants.
Pepper(Woody Harrelson): [pulls a baby calf out of the barn and the calf starts snorting] He sees it!
Sonny: Damn, that hungry devil thinks your little wee-wee is his mama’s teat.
Chango: Hey hey man, you guys can’t do this.
Sonny: I’ll ask you one more time asshole, where’s Teresa?
Chango: I ain’t telling you shit!
Sonny: It’s your call stubby, let him go Pepper!.
[Pepper releases the calf and it makes its way towards Chango]
Chango: whoa!,
[begins to moan as the calf begins to suck his penis]
Sonny: Damn, that looks like it hurts.
So many from Christmas Vacation
“Merry Christmas, shitter was full!”
“Hallelujah and holy shit! Where’s the Tylenol?”
Clark: Since this is Aunt Bethany’s 80th Christmas, I think she should lead us in the saying of Grace.
Bethany: Grace? She passed away thirty years ago!
Lewis: They want you to say grace - The BLESS. ING.
Bethany: I pledge allegiance to the flag of the United States of America, and to the republic for which it stands, one nation, under God, indivisible, with liberty and justice for all.
…and I may be a sick fuck, but that fried pussycat scream gets me every time…