“When we visit toilets, bathrooms, hotel rooms, changing rooms, etc. How
many of you know for sure that the seemingly ordinary mirror hanging on
the wall is a real mirror, or actually a
mirrors in female changing rooms. It is very difficult to positively
identify the surface by just looking at it. It’s time to get paranoid.
So, how do we determine with any amount of certainty? Well, once again, I
am here to enlighten you..”
the fingernail test works a treat 🙂