A story called 'Drawing Wrong Conclusions'

There was an old woman who crossed the Brazilian frontier every day on a motor scooter, with a bag of sand behind her. The customs officer eventually became suspicious and inquired, "What have you got in that sack?" "Only sand, sir" came the reply. The officer emptied the sack and indeed it contained nothing but sand. And so it went for a few weeks. One day, the officer said to the woman, "I won't arrest you or say anything to the police, but just tell me are you smuggling or not?" "Yes", she answered truthfully. "Well, what are you smuggling?" he pressed her. With a smile, she replied, "Scooters" and sped off into the distance!