Funny that. Just a bit ago, I hoped I'd have one. Turns out it really wasn't necessary and everything went ok when I just, you know, dared. Still, if I had one, I'd be cleaning slot machines out left and right. See the next hand, rewind and play accordingly.
Oh, and one would be great for my upcoming entry exams. Just see what they're asking, rewind, read that shit up and ace it.
But seriously speaking. I really don't think I'd want one anymore. If you only ever do sure things, if you never have to take a leap of faith, if you never dare to dare, you'll never learn anything and never get out of your comfort zone. There's never the joy that follows daring to be uncertain and getting better for it. You'll never learn anything from the dissappointments, either.
I smashed my comfort zone in the cranium with a sledgehammer two weeks ago, and came out so much happier it's utterly ridiculous.