Ok....it's not a comedy but a funny story. The Passion of the Christ......Dad (who is a staunch Catholic) demanded all of us kids to go see it with him. Of course, I was brainwashed as a kid into believing but during college I discovered the truth about the fairy tale...but my Dad didn't know it yet. So, I basically went to keep the peace.....years later it came to a head on a family beach vacation on a semi crowded beach....but that's another story. Anyways....I looked around the audience during the bloody torture scene and people had their rosaries out, praying, balling their eyes out....some groups of people were huddled, hands clasped, head bowed in prayer. Well I started silent laughing trying to hold it in.....and my sister who pretty much was agnostic in her beliefs at the time kept shooting me dirty looks like "shut the fk up!!" It was more like a laughter from being so uncomfortable than enjoyment. I just couldn't help it. Dad never said anything....maybe he didn't notice.
Now.....funniest comedy in a theater? For me, probably either 40 year old virgin or Team America: World Police. My cousin and I went to see Team America in Btown I think.....and when the song about freedom costing a buck o' five came on we lost it......and the puppet sex scene......comedy gold.