Proof

Last night, I dreamed that Dr. James Three Thousand and I were in some swanky hotel restaurant, having an urgent conversation because we were being followed. In the middle of the conversation, I noticed that a long-haired and bearded Johnny Damon was seated a few tables away from us. On seeing him, we knew that the time machine had worked! Then, the spies who'd been tracking us burst into the room, prompting us to fight and flee.

Proof of successful time travel.