My mom had told me since I was little not to flush the toilet while someone was in the shower. It was because when you did, it made the shower water cold. When I was 5, I accidentally flushed it because I forgot that my brother was in the shower. I started crying and my mom ran in the bathroom and asked me what was wrong. I told her that I flushed the toilet, and now all the pee was going to shower down on my brother. She set me straight, and I'm glad!
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 believe that take a shower meant to go steal a shower from the storeAnon
- I used to think that toilets led to the shower head. That's why I never took a shower :D— scared
- I used to believe that if you took a shower after a day of tanning the tan would come off in the shower— Shar
- I used to think that if you go into a shower nothing can hurt you because you're protected by water — Foxxip
- I used to think when I peed in the shower as a kid, the water coming back through the showerhead was my pee.— gregg