Seeing Things...

Lately I've been imagining a lot of one-armed people that aren't there.

It's true! I am continually seeing people short an arm (nothing wrong with that), only to discover that my eyes are deceiving me. On Tuesday for instance, I stopped at a Burger King for lunch and could have sworn the woman taking my order was missing an arm--but a few moments later, there it was, passing back my change! Odd. And then today at the zoo, the security officer walking toward me looked to have just one arm--but low and behold, it was tucked behind him as he walked... What gives? Why am I seeing--or should I say NOT seeing--these things?