"When he was two, he tried to put the cat in the washing machine. I happened to catch him doing it, and he said, 'He's dirty...' When he was 14, playing baseball on a travel team, his teammates told me he was diving out the second-storey windown into the pool. That should have been a warning sign." Jackass stuntman Johnny Knoxville's mum Lemoynce Clapp on her son's wild ways.