Beach sales

Generally the people would respond negatively and she would wander off,
but occasionally someone would nod and there would be a quick exchange of money for something she carried in her bag. The couple assumed she was selling drugs and debated calling the cops, but since they didn't
know for sure they just continued to watch her.

After a couple of weeks the wife said, "Honey, have you ever noticed
that she only goes up to people with boom boxes and other electronic
devices?"

He hadn't and said so. Then she said, "Tomorrow I want you to get a
towel and our big radio and go lie out on the beach. Then we can find out what she's really doing."

Well, the plan went off without a hitch and the wife was almost hopping up and down with anticipation when she saw the girl talk to her husband and then leave. The man walked up the beach and met his wife at the
road. "Well,? Is she selling drugs?" she asked, excitement pouring out with her voice. "No, she's not." he said, enjoying this probably more than he should have. "Well,? What is it, then? What does she do?" his wife fairly shrieked. The man grinned and said, "She's a battery salesman." "A battery salesman?", cried the wife. "Yes," he replied, "She sells 'C' cells by the sea shore!"