Desperate times call for desperate measures. While some head coaches in the forthcoming list have tasted success and created a prestigious names for themselves, the NFL is a real "what have you done for me lately?" league.It doesn't matter where you've been; it's where you are now. And if you're on this list now, you're in one of the circles of Hell, possibly a self-made one.Fans are calling for their heads, and their superiors at team headquarters are ready to roll out new visions. Here is a list of ten NFL head coaches who may be bracing for their end.