When would you travel back in time to?

If you could go back in time, where would you go and why would you go? (Please do not make any comments like "to prevent myself from being born", be serious.)

I would go back to 1999/2000 to go to an old Dream Theater concert to see one of my favorite albums Metropolis Pt. 2 before they split up!

 

I would probably go back to the battle of Verdun to experience the brutality of trench warfare/the western front as a whole.
Too bad I'd probably die.

 

I would go back to 2015. Why?
Well, then I can actually steer my path a different direction and stop being a lazy couch potato and become the person I hope to be

Also any christmas time, so I could ask for some Supreme and wear supreme yay happy fun time ken

 

I'd goto myself and say, damn, you are a fat lazy bitch that plays on a block game all day, well done with your life man, well done, then maybe I could be something successful right now.

 

To revist my childhood.