Dirty Rotten Scoundrels, Pure Luck or There's Something About Mary are all laugh-every-three-minutes chucklefests.
The first time I saw Dirty Rotten Scoundrels, there was one scene that involved a fork that had me laughing for days. No other movie had made me laugh like that. My partner thought it was stupid. She had no sense of humour. Pure Luck is the same kind of movie. When he gets stung by the bee...Pure comic genius.
There's Something About Mary is a true comedic masterpiece. There are more laughs in that movie...