Theoretical physicists would claim that it's not possible to go back in time and watch yourself play baseball.

The multiverse will accommodate all things that are possible.  However, no combination of probability waves will create a situation that is not possible.  Therefore, Rickey Henderson can't go back in time and watch himself play baseball.

On the other hand, theoretical physicists never predicted the singular greatness of Rickey Henderson:

"Under our Turn Back the Clock ground rules, not only can you go back to a game you saw in person, you can also go back to a game in which you actually played. And maybe it's no surprise who chose such a game.

'I would like to see myself play,' Rickey Henderson said, choosing Game 2 of the 1989 ALCS.

Well, you don't need the ego of Rickey to want to have seen him in action that series. He stole eight bases, scored eight runs, homered twice and had a 1.609 OPS in five games. He stole four of those bases in Game 2 alone when he pretty destroyed much the will of the Blue Jays' pitching staff.

'That was a fantastic series and a fantastic game for me, Rickey said. And I think that was one of the most important times and one of the most fun times in baseball.' "

PS - Thanks to my buddy who sent me the link.