We all know what going to the toilet and defining what #1 and #2 are, well, I believed that diarrhea was #3 as it seemed to combine 1+2. I actually thought there was a human body short circuit where the two were getting combined internally.
A childhood belief about weeing and pooing

others believed things like this
- I used to believe that a 'soul' was an organ of the human body, such as a kidney or lung. — Grace
- Since the girls name Jackie is short for Jacqueline, I thought the boys name Jack was short for JackalAnon
- My nephew (age 7) thought tampons were plugs for diarrhea. Anon
- when i was little i used to think i was the only human and everyone else were robots trying to act human.— Spikey
- My cousin's mom told my cousin that pop makes you short. He probably believed it.— Molly
- I used to think that "extra body" shampoo meant you could use the runoff suds to clean your body.— Christy