27. Barry Switzer
Switzer proved that winning a Super Bowl doesn’t make somebody a great coach after he inherited Jimmy Johnson’s brilliant winners. They did win the Vince Lombardi Trophy in his second year in charge, but it was all downhill from there. In his first season, Switzer showed that he didn’t share the same tactical brilliance as his predecessor in a game against the Philadelphia Eagles with two terrible decisions.

With two minutes left, the Cowboys sat on their own 29-yard line. Switzer told his offense to attack on 4th-and-1 with the game tied. He put his faith in Emmitt Smith, but the Eagles stopped the running back. The referees even gave Switzer a second opportunity to make the right call. But he didn’t, and Philly sacked Smith again. Three plays later they scored the winning field goal.