When I was little I had a switch in my bathroom that turned on a fan for ventilation. I used to believe that this fan was meant to let oxygen get into the room, and I would suffocate if I didn't turn it on.
A childhood belief about bathrooms

others believed things like this
- I used to turn the TV off when I left the room so I didn't miss anything.— S.Lee
- I used to think that oxymoron had something to do with oxygen...Anon
- when i was little i thought every time i left the room my parents turned into aliensAnon
- I used to believe that when people talked about 4x4 trucks, I thought it meant all the wheels turned.
— tracy - I used to think that tampons were meant to absorb women's urine so they wouldn't have to go to the bathroom.— Koyaanisqatsi
- I thought if something was radioactive it meant if you turn on a radio near it it would blow up— Nate