20. Steve Smith
Football is a violent sport that often gets emotions running high. So a player could be excused for being involved in a practice dust-up. However, Smith takes it too far. Not once, but twice Smith has broken the noses of teammates.
Steve Smith is lauded on the field for his tough play at the receiver position, but breaking your teammates noses causes them to miss games. Fortunately for players still in the league, Steve Smith has retired. Their noses are safe.