when i was a kid i used to think that when someone flushed a toilet while you were in the shower, the dirty toilet water would pour on you.
A childhood belief about bathrooms

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 monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G
- I used to think that trolls lived in my shower drain and showered with my dirty water— Troll bather
- I used to believe that the toilet would suck me down if I flushed it.— :-)