"Complimentary apple juice" was one of my favorite gags. After a customer placed an order, we’d explain that our ice machine was broken, so we were giving away free juice. "We’ve got grapefruit, orange, and... oh, sorry, looks like we’re out of grapefruit and orange. Would you like apple juice?" When the customer said yes, we’d play a recording of someone peeing into a cup, then say, "Okay. Your apple juice is ready. Please drive forward to the window and pick it up."