When i was like 6 I was watching rugrats. I saw the episode where they thought there was another world on the other side of the mirror. After that I thought that mirror recorded what I did. And I even tried to see if there was another world on the other side.
MORAL OF THE STORY: T.V. MAKES YOU THINK WEIRD!
A childhood belief about mirrors

you weren't the only one
60 of you believed this