If I have this ability ,I would back and prevent my parents marrige , therefore I wouldn't be existing in this world :D
Buy as much Microsoft & Apple stock as I could afford.
Fix all the mistakes made. Then, if I did, I would not be here and many things are good with my life. Who knows!
I'd like to take me a selfie with someone famous like Shakespeare :P
I would like to meet Jesus Christ and listen to their life lessons for hours and hours :)