20. Ryan Leaf
One of the worst draft busts in NFL history, Leaf was a disaster for the San Diego Chargers from beginning to end. They drafted him in 1998 and things went downhill very quickly for the second overall pick. After just three weeks with the franchise, he threw one of the most petulant temper tantrums on this list when he confronted a cameraman. Another journalist noticed this and wrote it down.

Later, Leaf targeted the journalist and got in his face. “Don’t talk to me, alright? Knock it off!” he screamed before teammates separated the pair. It was bizarre and immature from the volatile young quarterback. Needless to say, Leaf was the subject of scorn around the NFL after this incident while the journalist received sympathy. Things didn’t get better for him after this.