No.4 - Ronnie O'Sullivan: Set against his father's jail term for murder, "Rocket" Ronnie's indiscretions are insignificant in comparison. His first major problem came when he assualted an official at the 1996 World Championship - for which he received a two-year suspended sentence - and two years later he was stripped of the Irish Masters title for testing positive for marijuana. He also caused controversy with lewd remarks in a post-match press conference in China in 2008.