A new and inexperienced waitress tells another waitress she is concerned about being able to carry the heavy trays and serve from them.
The other waitress explains that tray stands are placed throughout the restaurant. The nervous beginner serves all her lunches successfully, and afterwards asks an elderly couple if everything has been all right.
"It was fine, dear," replies the man, "but my wife and I have to leave now. Could she please have her walker back?"