If such a thing goes unnoticed within ourselves, what about those we know? What changes could they undergo if we haven't seen them in years? Our memories betray us, giving us no indication of what they could have become. What changes lurk unseen behind their facade? How much of one's mind can you see through their eyes?
And what a pair of eyes this is.

What has happened to you, my old friend? You look so similar, and yet... You fill me with dread. Who are those people? Why does that woman look so aroused? There is only one way to know. I shudder at the thought.
Let's Watch: Woody Woodpecker