Inspired by the thread about milder vs cooler
If you are stood facing another person and they have something on their left cheek, where would you point on your own face to indicate this?
A. "Exact" - You point to your own left cheek, as the mark is on that part of their body
B. "Mirror Image" - You point to your right cheek, as if you were their reflection in a mirror
Whilst we have come to a strained cease-fire, the above has been very hotly debated between DP and I, and regularly causes confusion (and highlights how often I have muck on my face)