When it comes to comedy I just love the 1974 film Young Frankenstein. With the sight gags, and the play on words I find that it's a laugh out loud, quotable film. It's a Mel Brooks spoof on Mary Shelley's Frankenstein. The film follows the grandson of Frankenstein and his journey in fulfilling the legacy of reanimating the dead. It has a fantastic cast composed of Gene Wilder, Teri Garr, Cloris Leachman, Marty Feldman, Peter Boyle, Madeline Kahn, Kenneth Mars, Richard Haydn, and Gene Hackman. As funny as it is, it still has heart in capturing the misunderstood monster's predicament and how easily it is for people to fall into a mob mentality fueled by fear. Hands down this is one of my all time favorite comedies. Not only do I own it on blu-ray, I always watch it on t.v. when it airs. If you want to watch something classically funny, this film I highly recommend.
Here is a clip of the famous scene of Frankenstein and his monster performance to introduce him to the scientific community.