While filming Premium Rush in New York, Joseph Gordon-Levitt crashed on his bike into the rear windshield of a yellow cab and showed off his gash for director David Koepp's video camera. And then posted it on his website: "but it was my fault, I was going too fast," he admitted. He posts that he got 31 stitches. He's playing a bike messenger in the flick.
Gotta love this guy.