I'm a fan of humorous diagrams as much as the next guy. Okay, perhaps more than the next guy, because I just spent an hour reading through the archives of Indexed, a blog of diagrams that "make fun of some things and sense of others," as author Jessica Hagy puts it. Here are some examples:

Card 1089 - Indexed

Card 1088 - Indexed

Check out tons more.

(Via 43 Folders.)