When I was little, I used to read a lot of ghost stories, and of course, a lot of these stories dealt with mirrors and things behind them. I had a door leading straight to the family bathroom and besides the monster under my bed (we'll get to that in another anecdote), I thought that if I opened that door (which had the HUGE mirror directly on the other side) I would see SOMETHING with red eyes.
A childhood belief about mirrors

others believed things like this
- i told my mother that sex was when two people get naked and tell ghost stories.— linds
- I used to think that you could get a tan if you turned the oven on, opened the door and stood in front of it.Anon
- My sibs and I thought that the screen door was called the "scream door" so Mom could yell at us through it. — Kyle
- I didn't know Reindeer existed, I thought they were just christmas animals for storiesAnon
- That when u opened all the windows on just one side of the car the wind would make it tip over.— Schmackalie
- I used to believe that if I opened my eyes too much, they could pop outAnon