21. Willis McGahee
To be fair to McGahee, he had a bit of a chip on his shoulder after entering the league the year following blowing out his knee in Miami’s BCS Championship loss to Ohio State.
However his attitude didn’t improve once he found success in the league. After successive 1,000 yard seasons in Buffalo he decided he was to big for the Bills, trashing the city and his teammates in an attempt to force a move. Eventually the Bills had no choice but to move him.