I used to believe that when you flushed the toilet and the had the shower on at the same time, the toilet water and remnants would come out of the shower.
A childhood belief about general

others believed things like this
- 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 beleive that if you flushed the toilet that it would explode and all the water would shoot out.— Michelle
- I used to believe that take a shower meant to go steal a shower from the storeAnon
- 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 think that toilets led to the shower head. That's why I never took a shower :D— scared
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G