Do yourself a favor and go watch some of his work on Youtube. Incredibly funny. How couldn't it be when your writers were Mel Brooks, Carl Reiner, Larry Gelbart, Neil Simon and Woody Allen.
One of his last appearances was on an episode of Whose Line is it Anyway? where he's in a scene with Drew Carey, and they are supposed to be talking in different languages, while Brad Sherwood and Ryan Stiles are translating what everyone is saying.
Hilarity ensues. Absolutely great guy from classic slapstick comedy. They don't make them like that anymore.