Ozzy Osbourne is famous for biting the head off bats and snorting ants, but don't ask him to sign your colostomy bag.
 
The rocker admits he was appalled when a cancer survivor approached him at a recent book signing in America and asked him to scribble on his bag.
 
He says, "He goes, 'I'm a cancer survivor...I had the same cancer as your wife.' 'Oh great - good to hear.' He goes, 'You wouldn't do me a favor...' I said, 'Anything'. He said, 'You wouldn't sign my colostomy bag, would you?' I went, 'What...? No way'."

See more photos of Ozzy here!