5. Marc Trestman
The Trestman debacle in Chicago has put one of the most storied franchises in NFL history in panic rebuild mold. In two seasons, Trestman was able to turn rabid Bears fans into Bears fans that wore shopping bags over their heads. Not only did Trestman devise predictable game plans, he also lost credibility in the locker room. The lack of leadership transferred onto the field, where the 2014 Bears represented one of the worst teams in franchise history. After going 13-19 in two seasons, the Bears canned Trestman and anyone involved in one of the dumbest hires in NFL history.