13. Bobby Petrino
2007 was a disastrous year for the Atlanta Falcons. First, they hired Petrino and the celebrated college coach became one of the worst in NFL history. In fairness, the team suffered a major blow at the beginning of the season. They lost their star quarterback Michael Vick because of a disgusting dog-fighting scandal. This left the team with a massive hole in its offense.

It didn’t help that Petrino was unable to stabilize his team. They went 3-10 before he ran away to Arkansas (via NPR). The team resented the way he left. He put a brief note in their lockers before taking the job he repeatedly denied interest in. It was a weak way of handling business and it didn’t endear him to his former players. In the end, it was one of worst tenures ever in the NFL.