(We were giving away free packages of instant coffee for promotional reasons. Each package was about the size of a sugar packet.)

Customer: "What’s that?"

Me: "It’s a free package of instant coffee. Would you like one?"

Customer: "How does it work?"

Me: "Just put it in a cup, and mix it with water."

Customer: "Is the cup, and water inside the package?"

Customer’s Mother: "You’re a moron."