- The physical humor on West Wing. (example: in "What Kind of Day Has It Been", when Josh tries to sit on his nonexistant chair)
- The "Fresh Ink" line of greeting cards from Hallmark.
- The book of cartoons called No Comment, by Nurit Karlin.
- The scene in The Negotiator where Samuel L. Jackson is on the phone with a guy trying to explain that he's never supposed to say "no". (This may not be in the same category as the others, but I don't think I've ever laughed harder.)
- All of Stephen Wright's jokes. (But only the first time I heard them, whereas these other things seem to last longer for me.)
- EDIT 2004/2/3: Some of the less disgusting PLIF cartoons, such as this one.
And I'm sure there are others, but they're escaping me right now.