Comedy, moreso than any other genre, is so varied from person to person. In the same way it's hard to find a horror that will scare you after you know the secret, it's almost impossible to find a comedy that will make you laugh after you know the punchlines. What tops your list? These 5 make me laugh hysterically even though I've seen them 100 times:
I have to give an honorable mention, also, to EuroTrip just for the song "Scotty Doesn't Know". Funniest running gag in a movie ever. Also my favorite screen time for Matt Damon ever! "I did her on his biiiirthdaaaaay..."