All of the ones mentioned so far are great. Also My Cousin Vinny, Midnight Run, Get Shorty, The Jerk and The Burbs are among my favourites. I also really enjoy alot of subtle old comedies thanks to watching them with my mum when i was a kid. Like Bringing Up Baby, His Girl Friday, The Apartment, and City Lights.
The Burbs is a very underrated classic. Love that movie.
Another in my top 10 comedies of all time is
The Big Lebowski. One of the most brilliantly written movies ever made.