Got to ask, why? I guess I can understand not wanting to take a shit, but a piss?!
It all started when I was about five years old. My family was visiting some friends, and their sons were one year old than me and one year younger. The older one was making fun of the younger one for still sitting to pee. At that point, I too was still sitting. Though they obviously didn't know that, I still felt embarrassed and promised myself I would never sit to pee again.
That same year, my aunt decided to take me on a vacation to Weeki Wachee Springs State Park. This was also my first flight. The attendant kept giving me apple juice. I'd finish the juice box and she say, "More apple juice little baby apple boy?" and then cackle. Eventually I needed to use the bathroom, what with all the apple juice. My aunt asked if I could hold it and kept procrastinating. Once I reached an emergency situation, she finally took me. A large man exited the bathroom and she shoved me in and closed the door. The bathroom was a good 10 degrees hotter than the cabin because this man had left an atrocious turd in the toilet. I flushed it away, but the smell and fecal humidity remained, making me feel light-headed. That's when it hit me. The toilet was abnormally high – there were grab bars for handicapped people, but those would be no use for me. I could never hit the toilet bowl from a standing position, and I certainly wasn't going to break my oath. I panicked. Eventually, I took my pants and underwear off, stood on the toilet, and tried to pee straight down into the bowl. About five seconds in, the plane must have hit turbulence – I was thrown from the toilet and hit my head. I was knocked out cold. I woke up with my pants off, my penis exposed, and urine all over me. It felt like the entire plane was laughing at me. My embarrassment had led to even greater embarrassment. I promised myself I would never urinate in a plane again. It has been 30 years.