Have you ever seen The Office? That show on NBC? Well, condense that into a six inch comic strip and you'll have Dilbert exactly, except Dilbert is considerably funnier.
As stated in the summary, Dilbert is a comic strip that takes place in an office. Thus, most of the humor is office-related, though anyone who works, or well, even uses money will find this at least amusing. Since I need 250 words, here's a list of the characters in Dilbert as given by Wikipedia: Dilbert, Pointy Haired Boss, Wally, Alice, Dogbert, Asok, Carol, Ratbert, Catbert, Dilmom, Phil, Bob the Dinosaur, Garbageman, Tina, Ted the Generic Guy. And here is Dilbert: