If you’re someone who chooses the stall right next to the only one with someone in it, when every other stall is open, why do you do it?

Ah, that’s an interesting question. I think it comes down to a combination of convenience and a sense of camaraderie. People like to be around other people, even if it’s just the two of them in the bathroom. Plus, if you’re trying to do your business quickly, it can be easier to have someone else in the stall next to you because you don’t have to worry about being too loud and disturbing someone else.