Ping Pong Club.
Hands down. Just check for yourself, http://www.youtube.com/watch?v=dnwXTAL3fp0&feature=PlayList&p=A399CAE81ED35883&index=0
Thank you very much, this is fun, indeed.
As for my epicly funny animes:
Gintama: The anime does the manga justice and both are screamingly funny. There is a good balance between reference-gags and plain dumb/funny/random ones. It's an intense show that goes directly for your feelings(I have cried during some of the serious episodes ^^').
Ranma: It just doesn't cease to get funny for me ... Inu Yasha has it's funny moments, too(manga, mainly). I like the way the mangaka handles the daily absurdity slapstick.
Hakaba Kitarou: The last of the ghost tribe, born on a graveyard, goes through adventures and tries to fool mankind as much as possible. I highly enjoy the slightly bizarre, wacky sort of humour ... the soundtrack is also really good.
I also liked, but am too lazy to write about(sorry ^^'): Sayonara Zetsubo Sensei, Pani Poni Dash(omega^~^), GTO, Oruchiban Ebichu, Kyo Kara Mao, Negima!, Welcome to the NHK, Lucky Star, Kappa no Kai-kata, Seiyou Kottou Yougashiten: Antique(Antique Bakery). The Captain Harlock series & movies have their really funny moments, too.