Tell It To Me Tuesday: "Back To The Future"

Remember that dude from a few months ago that held the time traveler's party? On SNL they said people from the future were invited, but nobody came because they all knew it was going to suck.

My question to you is this. If you could journey back to any point in time what would it be and why? And, part two of this question, if you could relive any part of your own life again what would it be and why?