For several years after I first heard the term "bridal shower", I envisioned that it meant putting a bride, in her bridal gown, in the shower and turning the water on until she was soaked. I supposed she would be lucky if her gown completely dried out in time for the wedding.
A childhood belief about marriage

others believed things like this
- I thought the bridal veil was so that the groom wouldn't see who he was marrying.— Aretia
- 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 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
- I used to think that trolls lived in my shower drain and showered with my dirty water— Troll bather