Do you play cribbage Koo?  If so you've probably played at least one person who wants to replay hands....trying to figure out what they would have scored if they'd put different cards in the crib, or played the count differently.  

When top-line came out I was steeled to take a near total loss....I'd accepted that as the price of admission.  Now its like I drowned and someone has mysteriously reached down and pulled me up so that my head is above water....its human nature to want to know who it is....or in this case why.