In a bathroom, when there are multiple stalls to choose from, have you ever stopped and thought about the process you go through to decide which one to choose? You avoid using the accessible one in case someone who needs it comes in after you. If there's one already occupied, it's courteous to choose one that's not right next to them. Obviously, if there's something still in the bowl, you have to do the sudden stop and back out. You don't want to pick the smelly one, because if someone comes in after you, you don't want them to think you're the one who stunk it up. If you do have to stink it up, you pick the one farthest away from the door to minimize spread.

If I'm a habitual user of that particular public bathroom, I tend to choose one stall and stick with it. When I was in preschool, it was held in the church basesment. The church bathroom had two stalls and for as long as I had remembered, I always used the one closest to the door. One day, during a bathroom break, I was next in line and the one farthest away from the door opened up before the one I always used. The teacher told me to use the open one, and I threw a fit because I wanted to wait for the other one. I don't think she knew why I was throwing a fit, though, because I was stood in the corner for that little fiasco.