As a Lions fan, I find it hard to believe that any other franchise has been blessed with the level of moron that we've had at the head coaching position, but I know there have been some terrible coaches around the league.
Here's the bar, our luck started after Wayne Fontes if you can believe it...
Bobby Ross 27-30 Quit the team mid-way thru the season due to stress
Marty Mornhinweg 5-27
Steve Mariucci 15-28 Had no HOF QBs to win for him, ruined many a promising career
Rod Marinelli 10-38 The man who led them to their perfect 0-16 record
Jim Schwartz 29-51 The handshake incident & lost it on the fans during his last game...classy guy