And this is the terrible part. Sometimes, when I leave the house and walk away, I am suddenly convinced that I have failed to lock the door behind me and have to go back and check. Or sometimes I think I have locked the door, but have forgotten to bring my key, and have to reach into my pocket check that. It’s not rational, but it’s something I experience often. And it was a similar sort of feeling I got when I hit that button — I suddenly became convinced that betting all but $1 was the wrong thing to do, that it would leave me a dollar short even if I got the clue right and Mark got it wrong, that I had screwed up and done something incredibly stupid and there was no way to fix it.