When I was ten I was convinced my mom had eyes in the back of her head. I'd stick my tongue out at her when I was positive she wasn't looking, yet she would know.
Now that I'm a mom, I realize that it's just something moms know. I know when my kid rolls her eyes at me. I can almost hear them roll to the very back of her pretty head.
Lord knows I don't have eyes in the back of my head. But I found this one on my butt today: