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His antics are often ascribed to cheekiness - or, by more thoughtful pundits, his 'troubled soul'. But O'Sullivan's erratic baize etiquette (such as draping himself in a wet towel during a defeat to Mark King in 2005) and repeated threats to quit the sport are better explained thus: he doesn't know how to lose. His gracelessness peaked in 2006 when, early in a UK Championship quarter-final against Stephen Hendry, Ronnie missed a pot, frowned - and briskly conceded the entire match. He called it 'a bad day at the office'. Another one.