I peed standing up once when I was eight years old. It was in the middle of the night and by accident. I was half asleep. I walked to the toilet, put my panties down to my ankles and peed. It all made it in the toilet, no mess. I then turned to get toilet paper. I saw the bathtub instead of the toilet roll and that was when I realized I was standing up the whole time. I wiped myself and put my underwear back on and went back to bed.