25. Pat Shurmur
Shurmur had one of the shortest tenures on this list when he took charge of the Cleveland Browns. He had built up a reputation as an offensive coordinator. This persuaded the Browns to take a chance on him, but little did they know just how bad things would turn out. In short, he was a total flop.

The Browns actually regressed in most departments after Shurmur took over. They went 4-12 in his first year but they didn’t fire him. Then in his second season, their record was almost as bad at 5-11. Enough was enough for the Browns who fired Shurmur and General Manager Tom Heckert Jr. In 2019, the New York Giants fired him after an equally mediocre turn of results.