When I was 15, my family was on a long holiday, we were travelling day and night in the family people-mover. My 3 siblings and I were travelling in the back and, being a 15-year-old, I was always horny and looking for somewhere to jack off-petrol station toilets, caravan park toilets, anywhere would do. This night I was particularly ready to go and knew we would not be stopping soon. I had my doona in the car with me and proceeded to pull myself silly right in front of my brothers and sister-under the cover of course.
When I let loose I dumped all over the underside of the doona, which left me with a big wet mess to sleep in and a big suspicious snail trail the next day.
It was well worth the thrill though.