I'm just going to jump into this one as there isn't really a good lead-up to these particular random thoughts.
Do you have a particular personal policy on choosing your bathroom stalls? I start thinking for example, that at work the large group bathroom has four stalls and we have roughly 100 women who work in the office. If we all each used a random stall each time we went to the restroom, we'd each be exposed to 100% of the other female worker's germs. BUT if the stalls were divided evenly among us, we'd each only be exposed to 25% of the female work population's germs. Think about it.
Also, ever since seeing Vh1s pop-up video of Jewel's Who Will Save Your Soul in which one of the pop-ups claimed that the first stall in a bathroom is the least used and the cleanest, I have whenever it is not obviously messy, chosen the first stall.
Here's the video for your obsessive compulsive enjoyment:
Aren't you glad that you don't live in my brain?