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http://i.imgur.com/78asK.jpg

Anyone remember the show Oz?

I stumbled across this and thought it worthy, although not sure how much he qualifies as a celebrity. Apparently he has a radio show on Howard Stern's Sirius station....

Robert Downey Jr. is pretty serious about The Chun.

David Mamet is a dedicated jiu jitsu practitioner . Probably wouldn't qualify as a celebrity, but he's a pretty famous writer.

I heard...