Kevin DuBrow, former lead singer of Quiet Riot, was my third cousin.
My ex girlfriend was (I assume still is) a friend of Dave Matthews. She met him before he was famous when he first moved to Charlottesville, VA (she grew up there) and they were friends from then on. When they came through Denver while on tour he sent her two front row tickets and back stage passes and we hung out and partied with him after the show.
Also my childhood best friend's cousin was Mackey Sasser (NY Mets catcher famous for not being able to throw the ball back to the pitcher).