Had some lady do that the other day outside a supermarket. I think she thought I was smoking and so did the whole knee-jerk-reaction-brainwashed-into-being-rude-to-others-because-they-enjoy-something-I've-been-told-to-dislike thing. She got surprised when I start laughing really hard and then got embarrassed when I showed her what she was coughing at and told her it wasn't even smoke. Ha!
