Control+Z, it's a nice concept..
I have gone back and apologized for my wrong doing and asked for forgiveness to those that deserve it. It would be nice to be able to 'erase' a time when I might have said the wrong thing, laughed at a wrong time, or tripped in front of a large crowd of people. The thing is, I always am able to joke about the wrong thing I said, apologize for laughing when I shouldn't have and get right back up and say "I hope someone was able to get a video of that because that should go on Youtube!" after falling down.