It's no secret that the great ideas and existential thoughts come easily while you're in the shower. There's something to be said about forcing yourself to be alone with your own thoughts.
On that note, unless there's an unknown force recording all of the history of existence, I do have a hard time believing in the possibility of backwards time travel as told in sci-fi. I don't think the laws of physics care much about our clocks and perception of time. On the other hand, it's a fools folly to deny the possibility of anything in science.
I sound like I'm talking to myself in a shower right now.