When I was little my mother told me that if I stayed in the tub too long I would turn into a prune, and I believed her entirely, I thought that the purpleish wrinkled skin would continue to progress and that I would spend the rest of my life in the pantry. This also made me think that eating prunes was cannabalism, which I knew about from my grandfather's tall tales (that I didn't know were tall tales).
A childhood belief about bathrooms

others believed things like this
- I used to believe if you stayed in water too long your skin would get really wrinkled and stay that way.Anon
- I didn't want to get tall when I was younger because I believed that I would fall over. — Gabi
- I used to believe that eating vegetables would make me particularly tall— Aleksandr
- That everyone had the same amount of skin and that short people were fat and tall people were skinny.Anon
- My dad told me that playing basketball makes you taller. Basketball players are tall, so I believed him.Anon
- When I was little i thought grandparents had to be hundreds of meters tall... Anon