Prodded by another current thread about weird superhero powers, I’ll start the thread I’ve been meaning to start.
If you could mentally reset the world to five seconds previously, what would you do with it? I’ve had an impulse to throw my keys down the sewer. This way I could do it and get them back.
It’s been pointed out that you could set a new Jeopardy record, and make a bundle that way. You could make a daily living just betting people in bars about trivial stuff.