A childhood belief about mirrors

I used to believe that if you started at your own reflection for long enough you're reflection would turn into the devil.

I often sat at the end of my bed staring at my reflection for hours, hoping I could see this actually happen - it never did though...

I also used to believe that mirrors were the windows of a paralell universe and there was someone in this paralell universe who was a clone of you, had the same rooms in the house, same clothes, same personality. So when you went to look in the mirror, the other person would too, so you'd be able to see what you look like.