Most of us wish we had the ability to turn back time. That dance in the 7th grade where your crushed turned you down? Don't ask her to be your date. That time you broke your arm because you were doing something stupid? Go back in time and don't be stupid. See how awesome that would be?
Unfortunately, they don't exist quite yet and these pictures are proof of that. They're filled with things that you'd need a time machine to reverse.