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There is no freaking way to narrow this down to one scene, but these are some of the comedy scenes that have made me laugh til it hurt:
The campfire scene in Blazing Saddles
Gene Wilder and Marty Feldman playing charades while Peter Boyle is choking Wilder out in Young Frankenstein
Robert Hays and Julie Hagerty dancing to "Stayin Alive" in Airplane!
Barbra Streisand and Ryan O'Neal inside the chinese dragon in What's Up, Doc?
Will Ferrell's meltdown on the racetrack running around in his underwear in Talledega Nights: The Ballad of Ricky Bobby
"The Inquisition" in History of the World Part I
"I'm Tired" in Blazing Saddles
Woody Allen being forced into a taxi cab by a pair of thugs in Broadway Danny Rose
Woody Allen, Diane Keaton, Alan Alda, and Anjelica Huston trying to trap an alleged murder with a doctored audio tape in Manhattan Murder Mystery
The knock down drag out fight in the newsroom between Will Ferrell and Christina Applegate in Anchorman: The Legend of Ron Burgundy
Barbra Streisand on her opening night at the Ziegfeld Follies coming out with a pregnancy bump in Funny Girl