1 Shakespeare: Time travel could work a third way.
2 Shakespeare: Maybe you can change history, but it creates a new timeline each time you do so.
3 Shakespeare: You can return history to the way you remember it just by jumping back to the original timeline.
4 Shakespeare: So it would be the best of both worlds!
4 Mercutio: Infinite worlds.
4 Ophelia: Yeah, so there’s no chance of that.

I was seriously wondering if perhaps the real William Shakespeare had invented the phrase "best of both worlds". But cross-referencing a bunch of website hits, it seems the idiom only appeared in the 19th century.