Shortest job security in the NFL: placekicker for the mn vikings!
Nothing like having your job on the line for every kick in training camp and every snap in preseason games; and if you miss, your coach calling you out in the media to say he has no confidence in you -- it makes for such a strong-minded, highly successful kickers! (and wasted draft picks!)
Imagine if MM had given up on Crosby during that awful year he had (by his standards)...