I used to believe that if you flushed the toilet when you were still on it your internal organs would get sucked out. The most distressing part of it all was not because that would hurt a whole lot but because they'd have to take you to the hospital sitting on the can and turn you upside-down so everything would slide back in!
A childhood belief about fear of

others believed things like this
- I called every body part my elbow. For example if my leg hurt I would say my elbow hurt.— Kady
- I used to believe that monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- I used to believe that if I flushed the toilet before I showered, I would take a shower in dirty toilet water.— Chris D
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G
- I used to believe that if you didn't close the toilet lid after flushing, you would get sucked down into it.— Maya
- i used to belive that when you flush a toilet on an aeroplane you get sucked down— milly