Peyton Manning or Ryan Leaf... picking the franchise quarterback may just be the biggest crap-shoot in sports. Of all the QBs drafted in the NFL, who would have predicted that a No. 1 and a No. 199 would be the greatest of all time (so some would say).

It is the job of coaches and scouts to evaluate talent and find the best of the best from the college ranks. It works out less than half the time. When it does, greatness happens, and when it doesn't, they eat crow; and the fortunes of a franchise rise or fall in the blink of an eye.

I've included 20, first round QBs, who busted despite showing Montana-esque talent or potential. The only other criteria was that they had to be a top 7 pick that year. A few actually had minor success before caving to the pressure. Here's the list: