I've learned a few things over the years. One thing I've learned is don't fart in hotel lobbies. Inevitably, a few seconds after passing wind some guest will come by. If there's no one else around they'll figure out where it came from likity split. Not so with elevators. If you pass wind inside one and get out, then you can send send the elevator off to some other floor and go about your business. And if someone gets on, well most people don't comprehend three dimensions all that well.