Had occasion the other day to tell off an obnoxious mundie.
"Why are you dressed like that?"
"I'm not."
I didn't think it was an especially witty comeback, but his reaction was marvelous. He rolled his eyes and started to go about his business, then jumped like a startled cat, turned back to me, stared hard, and started "But..."
He must have decided then that I was some sort of dangerous lunatic, because he fled like a bat out of hell.