A childhood belief about weeing and pooing

I used to believe that all children were born girls then if they stood up when they peed enough times then they turned into a boy, well when i went to nursery i told my friend this theory and we both decided life would be much better as a boy, so decided to stand above the toilets when we peed, this resulted in my friend falling and getting her foot stuck in the toilet and the fire brigade having to cut her out. Our teacher was not amused. We were even less amused to find that we were stuck as girls for the rest of our lives. The sex talk came soon after