Er — have the Bludgers ever killed anyone?” Harry asked, hoping he sounded offhand.
“Never at Hogwarts. We’ve had a couple of broken jaws but nothing worse than that. You don’t have to worry about the Quaffle or the Bludgers —”
“— unless they crack my head open.”
“Don’t worry, the Weasleys are more than a match for the Bludgers — I mean, they’re like a pair of human Bludgers themselves.

Author: J.K. Rowling