I know exactly what you are talking about. I think I do it alot now, but my example isn't as good as yours.

I was putting off a paper so I could watch a football game. I was doing some of it at halftime, but when my team lost the ball with 3 minutes left in the first half, I thought to myself "the odds are, they won't score so I shouldn't miss anything worth seeing." I turned the TV off and worked on my paper some.

I know this example isn't as clear as yours, but I couldn't think of a better one. When I do, I will post it.

ps. the redskins apparently blocked a punt while i wasn't watching and scored. damn.