^^^^
It depends on what kind of humor one likes. Some like physical humor... eg govinda movies in 90s, and most of the bollywood comedy movies. You are supposed to 'keep your brain aside' to watch these movies.
But in bollywood, they always expect people to keep their brains aside while watching a comedy movie. Why cant they make intelligent movies with good humor!
Anyway, i will try to recall a few :-
Gunda(don't make a mistake of watching it with family
)
Clerks
The Big Lebowski
Austin Powers trilogy
Matrubhoomi (though it is a serious movie, first half has a bit of dark humor)
In Bruges
Andaz apna apna
Pushpak
Fight Club
Trainspotting
Snatch
Borat: Cultural learnings of America for make benefit glorious nation of Kazakhstan
Beerfest
Harold and Kumar go to white castle
Chupke Se (2003) - I am sure many of you haven't even heard of it. Give it a try.