Ronnie O'Sullivan

From Frikipedia

Snooker player extraordinare.

Has probably won lots of things, but is more famous for getting to a certain stage of a tournament and then going crazy, either crying in his dressing room during intervals, swearing at the table or playing with a small towel on his head.

Curiously, this weirdness began to occur shortly after Friki put a bet on him to win a certain competition. Making him an integral part of the Frikipedia Betting Curse.