A childhood belief about family

I used to believe my mother had eyes in the back of her head because she always caught me doing something I shouldn't have been. I could never find her eyes, she said they only opened up when I was doing something bad. I remember testing her one day when I was about 5 or 6: we were in the kitchen and she had her back to me, she was standing at the kitchen sink washing dishes. So I stuck my tongue out at her and she said "I saw that, put your tongue away!" I was flabbergasted!! I finally figured out what happened that day in the kitchen: you guessed it, the WINDOW over the sink showed my reflection! Of course, I was 15 and in a different house when I finally figured this out!