And you could only do one thing. And you were not allowed to change anything. And afterwards you would have to return to your own time thing. Or else the universe would implode on itself and destroy everything, including the nothingness, and all chocolate ever made.
You don't want to do that.
What would you do?
I would travel to about the middle of the 18th century, and read Emily Brontës second novel before her silly sister had the time to, rumour has it, burn it. Apparently she was doing it to save Emily from the harsh, contemporary critics who hurt her a lot over Wuthering Heights. #INFJs
(No, I'm kidding. I love INFJs.)