Not again

I want a "backspace" button. A real life Ctrl-z, so I can go back in time and tell myself how much I'm going to regret doing what I just did in a few seconds, or hours, or days. Because the brain has a wondrous ability to smooth things over, to fill in the blanks, so that a few seconds, or hours, or days later you think "oh but it's ok, it wasn't that bad". And however much I say to myself "yes it was, you're just making that up", it's like being your own mother and your own teenage daughter at the same time. "That guy will break your heart." "Oh mom, you just don't get it."