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I always felt like the explanations people give are way too complicated. The simple version, to me at least, is this:

A mirror doesn’t flip left to right. It flips front to back. YOU flip left to right when you turn things to the mirror.

You're in a room with your friend. You look at a sign on his forehead saying "AOM". There's a mirror on the wall. You can see your friend in the mirror, the sign on his forehead is now saying "MOA". Nobody turned anything to the mirror, the whole scene is stationary. Why is it "MOA" instead of "VOW"?

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