You'll Always Smell Smoke Before You See Fire

My wife and I are sitting outside a Starbucks drinking a coffee and people watching while we wait for Jenny's first Avon meeting. Two teenyboppers were sitting outside, as were we, but the chirrun were smoking. Jenny and I took seats across the patio frok them so we didn't have to smell their smoke. Well, the security guard for the shopping center took as much offense as we did, because he chased them off. Just then we noticed the conspicuous No Smoking signs posted on every vertical flat surface, including right above the oblivious youngin's heads. Fail!