Slipknot star SHAWN 'CLOWN' CRAHAN has developed a creepy hobby - he's studying cannibalistic worms. The masked drummer has spent months obsessing over the worms he bought from a bait shop in his native Iowa. He tells rock magazine Revolver, "I started with 17 and now I'm down to 13 because they're cannibals. I sit there and watch them eat each other. "The other night, I got so mad because one was alive, and the other was trying to eat sideways through its head. I almost took him out and smashed him with a hammer."