Jim Zorn (Washington Redskins)

A mediocre quarterback becomes a forgettable assistant, then gets elevated to the top job in the morass known as the Redskins under Snyder where he proves much less than adequate. In fairness I suspect Vince Lombardi would struggle working for an owner like Snyder, but that doesn't negate Zorn's evident lack of the right stuff to be a head coach. Seems like a nice guy though.