I started out with a more interesting (but less amusing) discussion about probability. The guy was taking issue with the idea of being “due” for good luck, which is a gambler’s fallacy. If you flip a coin ten times and it comes up tails each time, the odds are actually better than even that it will come up tails again. With a perfectly fair coin they’d be even, but they’re slightly better than even because a run of tails like that might indicate an eccentricity in the coin or some trick in play which makes the coin favor tails.
While that is all kind of interesting, it was not leading me to a poop joke. So I had to ditch it for this.