I like Dinner for Schmucks, at least I found it funny. There are a few on my mind I just can't think of any right now >_<
Office Space is the best movie. I love comedies with subtle humor. Not to mention it's a cult classic.
In india best comady movie is : Andaz apna apna, Fir hera feri In Hollywood : Dr. Strangelove, Beverely hill chihauhua, Scary movies...
"The Dictator" is the best comedy movie I guess. It is a satire and it has shown the demerits of dictatorship in a fantastic way.
"Dr. Strangelove" "The Big Lebowski" "Groundhog Day" "Spinal Tap" and all those mockumentary style movies