That's the thing. Your memory only works one way. You're incapable of perceiving time running in the opposite direction.

Every time you've pooped both in the past and the future*, it's both going in and coming out, entirely dependent on the frame of reference.

*Yes, I did just refer to the future in the past tense. Because if time's running backwards to how we perceive it, that's actually the past.

The only way to win this game is not to poop. And good luck with that.