Jack Osbourne allegedly slaughtered chickens when he was a child.
The reality TV star's sister, Kelly, claims he killed three chickens - and says birds are still terrified of him.
She is quoted in Britain's Daily Star newspaper as saying: "He once murdered three chickens in a row when he was a kid.
"I'm sure birds can sense these things - when Jack goes near them now, they fly in the other direction."
Last month, the 19-year-old admitted he loves the thrill of sex with strangers.
He said he can't get enough of no-strings sex and thinks one-night stands are brilliant.
The star told Britain's Now magazine: "One-night stands are fun. My mates reckon I've got a conquering complex, I don't know what's wrong with me. I'm a twisted man."
He also confessed he never has a problem pulling the ladies - because he knows how to make them laugh.
He said: "Every time I pick up my sister Kelly's magazines it says that girls look for a good sense of humour - and they get that with me."
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