You're in a hurry to go to the bathroom. You really, really need to pee. You slam open the door--it's lighter than you thought which accounts for the slamming--and note that the middle stall is taken already. You think about the statistics and the psychological tendencies of people when they go to pick out a stall. You reason that the polite thing to do is to pick the stall two over as you would give them the privacy they need, but it's also rather odd that you're thinking too much about this.
If you were a boy and you went to the standing toilet thing boys use, you'd use the one two over, so this makes sense.
After you're done, you realize how empty it is in the bathroom. You wonder whether that person in that stall is okay, especially since they were situated in there prior to your entrance. You come to a realization that you should leave as they might want privacy. You go to get some paper towels to dry your hands, but that's when you see it. In the mirror. Your eye make-up is running. You can't possibly leave the restroom like this.
You make quick work of pulling your eyelids with a paper towel, and then you hear it.
It's reluctant and there's an embarrassed sort of silence right after, which is worst as it almost draws the noise out. A reluctant fart. A reluctant fart from the stall with the silent person.
You blush, but you don't want to embarrass the person. You run the water to kill the tension, but that person is still silent.
You bite back an apology and leave as quick as you can.