Bench remorse
In fantasy sports; an owner realizes that a player left on the bench scored enough points that would have given him/her a win for that week.
Mick: Damn it, I played Ladanian Tomlinson this week instead of Frank Gore. If I had played Gore, I would've have won. Now I'm out $100 and my wife won't talk to me.
Paul: Damn, that's one hell of a case of bench remorse.
Paul: Damn, that's one hell of a case of bench remorse.