One of the best, if not the best anime/manga series ever created. With an extremely intense psychological plot, all fans of a good series such as Death Note should watch this show immediately. All fans of crap like Naruto, Bleach, One Piece, Fairy Tale should stay away from it though. Code Geass fans should probably stay away too. By Nobuyuki Fukumoto, this series follows the life of Kaiji Ito and all the shit that he goes through. Has a weird art style that you'll only appreciate once you actually follow the series. Two anime seasons have been produced by Madhouse thus far.
Also, Kaiji is very very intense. A real man's anime.
Craig: Hey man, have you seen Kaiji?
Samwell: Nope, it looks kinda crap.
Craig: Oh, no worries, that's probably because you're gay.