Metta World Peace (born Ronald William Artest) is an NBA star whose basketball history is extremely rich.... if you're talking about eccentric tirades and unprofessional behaviour.
Artest had something of a penchant for violence in his earlier days, and was involved in a number of high-profile bust ups. Then he changed his name to Metta World Peace and professed that he was a changed man.
He currently holds the record for the longest suspension for an on-court offence in NBA history, standing at 86 games, for his participation in the infamous Pacers vs Pistons brawl.
Not a fan favourite by any means.