You were walking down the streets of Gotham City at night. It was cold and dark out, yet peaceful... At least it was until you heard sounds coming from a nearby alleyway. When you went to investigate, you saw a man in the shadows surrounded by a bunch of unconscious goons. You can only really make out the crimson helmet of the man before he speaks out loud.

"Well? Like the view?" The man says in a snarky tone. How'd he possibly know you were there without turning around?