I used to believe that thing in the sink (I don't know what it's called, it's like this hole halfway up that water drains into if the sink gets too full) had an alien living in it, and if I put my hands in the sink it would pop out and eat my arms.
A childhood belief about bathrooms

others believed things like this
- If you eat 30 minutes before swimming, you will sink.Anon
- i used to believe that a monster lived in the garbage disposal. i would never go near the sink— Whitney
- I thought the ball-headed person in the Bic logo was an alien and communicated using alien-like noises.Anon
- I believed you could dry your hands with hot water, until i got a chance to try it.— A A RENN
- When I was little, I thought that Water Towers were full of dirty laundry. Why? I dont know.Anon
- I used to believe that a hamburger was called a "handburger" because you ate it using your hands. — ELEKTRA