Like some strange breed of Shawshank prison, the NFL has the ability to institutionalize its members.
First players are just along for the ride and doing it for the money and fame. Then, slowly but surely, it becomes all they know. They're trapped.
And some players keep trying to cling to their football careers. They don't know how to say when.
There's always a long list of this type of player. The guy who probably should've retired before the season started but is still hanging around, trying to make one more run.
Now, understand that I realize some of the guys on this list will surely prove me wrong, summoning one more season of competent or even quality NFL work. But let's face it, I'll probably be right about most.
(Sorry Ricky Williams haters, he won't be making an appearance. For some strange reason I think the mercurial Williams still has a part to play.)