Remember woodchip wallpaper?
As i kid I has that in my bedroom, and when I went to bed I used to love to pick the bits of wood out from it. One night I couldn't sleep and went on a bit of rampage and proceeded to do an entire wall. My mum went mental when she saw it in the morning and on asking me what happened I told her that as I was looking at the wall, the woodchips "fell off"......I genuinely expected her to believe me, and was stunned when she didn't.
I got such a walloping for it too :-(