Joel McHale went to the University of Washington. He was recruited by the crew team, but things changed! Even though he hadn't played football since his freshman year of high school, he was asked to walk on as tight end for a game and ended up taking the team to victory at the Rose Bowl in 1992.
Emma Watson: Field Hockey
It's not quidditch, but it's close! The Harry Potter superstar and Brown University graduate somehow managed to add field hockey to her busy schedule. Maybe that's how she was so good at quidditch...