Up to age 8, I thought that in mirrors there was a whole different world where there was an exact copy of you and everyone you knew. Well, my grandparents had this huge mirror. I wondered what I was like in "Mirror Land", so one day I started putting notes behind the mirror, between itself and the wall, thinking the "mirror me" would read it. I sat there for hours waiting for "mirror me's" note to come out of thr mirror. At age 12, I still think mirrors are a little creepy.
A childhood belief about mirrors

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