An offer we couldn't refuse

At the airport this evening the TSA guy was warning everyone in the security line to make sure all their liguids, gels, lip balm, etc., was displayed in a quart-sized ziploc bag. "Chapstick? Really?" someone asked, and "Just to be safe," he replied and handed over a bag. Then he turned back to his post near the head of the line and sang out this somehow attractive yet amusing call:

If you have liquids or gels, and yet have no quart-sized ziploc bag, ask me for one, for I have many, and they are free.