16. Keyshawn Johnson
We expect diva behavior from wide receivers, but Johnson takes it to another level. He wrote a book about himself during his rookie year. Who does that? Brash and arrogant.
Johnson quickly wore out his welcome at each of his stops. In fact, after the Bucs deactivated him for the final 7 games of their season, the Panthers cut him just one year into a four-year deal they had with him. Talk about a toxic work relationship.