Vin Diesel is known for playing the 'tough guy' in most of his films, and is recognized mostly by his appearances in the Fast and the Furious franchise. Vin Diesel is also known for starring in the semi-successful film, xXx.
As it turns out, Diesel is not only a tough guy, but he is a tough guy who isn't afraid to admit that he's been playing Dungeon and Dragons for over 20 years. He's not a fake fan, either. Diesel wrote the introduction for the book 30 Years of Adventure: A Celebration of Dungeons and Dragons.
If you don't think that is enough to prove his allegiance to Dungeons and Dragons, go watch the film xXx again and look for a tattoo on his stomach that reads 'Melkor' - it's the name of his D&D character.