I'd like to see a man wandering the desert wastes. His name is Gordon, he wears power armor and glasses. No matter how hard you try to get him to say something, he remains silent.
(Half Life reference lol.)
Perhaps, at night, you hear a voice from behind you, saying something indeterminable, steadily getting louder. When you turn around, it stops, and there is a skeleton there that wasn't there before.

oo:
Maybe a return of the Mad Preacher from Fallout 3, wandering the desert, mumbling and ranting about the "Great Worm" while hugging a Mini Nuke. He seems to completely ignore your existence as he wanders into the distance.