What rock star in concert bit the head off a chicken?

It was Ozzy Osbourne, but it wasn't a chicken. It was a bat. It flew into him at a concert and he was in the moment being a dark rockstar so he thought "why not bite the head off this thing" and did it. It was total instinct to draw headlines. We are still talking about it decades later. It might have been on accident, but it was a very smart marketing move.