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Dungeons and Dragons! But that might be because the only D&D forays into cinematography have been less than spectacular.

There have been a few good web comics[1] and short videos[2] based around D&D. I can envision a D&D movie.

Hey! You forgot Order of the Stick! (Even if it is more a parody)

I quite enjoyed The Gamers: Dorkness Rising, though it has been a while since I watched it.