When a new college football coach is hired, there is usually optimism among that team's fan base for the future. That is because, in many instances, the new coach is replacing someone who did not have much success.

However, there is no guarantee that the optimism will last. And sometimes, the new coach does not stick around that long either.

Hiring a head coach for a college football is not always a simple process, although some athletic directors are lucky to have obvious choices emerge when they decide to make a change. But for most athletic directors, they must use the interview process to find a coach that has experience to get the job done on the field and in recruiting.

Absent the obvious choice, there will be mistakes. And even if you do find the right coach, he may not necessarily be able to win enough games.

There are many examples of bad coaching hires throughout college football history, but let's take a look at some of the worst we have seen in the past decade. Scroll up to see the top 10.