12. Mike Riley, Nebraska (2015-2017)
Bo Pelini was fired from Nebraska in 2014 after winning at least nine games in every season of his Cornhuskers tenure. While he consistently won games, Pelini was never able to get Nebraska over the hump. That led Nebraska to the hiring of Mike Riley, whom it thought would be able to take it over the hump.
However, Riley was 61 years old at the time and had just wrapped up a 5-7 season at Oregon State. He hadn’t won nine games in a decade, and Pelini never fell under that mark during his time at Nebraska.
Riley went 6-7 in his first year, 9-4 in Year 2, and 4-8 in Year 3, leading to his firing. The hiring of Riley was the beginning of the fall of Nebraska football -- more on that to come later in the article.