At one point in time, I believed that on the other side of a mirror was another world. I used to have nightmares about someone from the other side sneaking through, and I also used to believe that if I moved fast enough, that my reflection wouldn't be able to follow me and I could slip through. As I got older, I realized that I would have to travel faster than light to accomplish that.
A childhood belief about mirrors

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