His mouth shut?
What if you walk by and, after you are about 15 feet away, he says “Daaaayyyyyyuuuuuuuuuummmmmm!”
I would assume he'd seen a cool sports car, and turn around to look at it. Or, if I were (as today) wearing my Free Republic t-shirt with my name on it, I'd figure he was overwhelmed at seeing the famous Tax-chick in Real Life :-).