bus accident
when you can't get off the bus (out of your car, into the house,walking on a beautiful day) in enough time to make it to the bathroom. therefore....causing a bus accident....LMAO so one shits their pants and causes you to have to throw away what ever you are wearing and clean up the mess.
riding on a bus and getting the feeling of "uh oh"....and not making it off the bus in time to get to a bathroom. thus you have a bus accident....shit your pants....