Customer: "My mouse doesn't work any more."

Tech Support: "Is it an optical or ball mouse?"

Customer: "Huh?"

Tech Support: "Does it have a ball or light?"

Customer: "It has an light on top."

Tech Support: "On top?"

Customer: "Yeah. It was underneath before, but it looks better when it's on top."

Tech Support: "Ok, try turning it around so the light points down on the desk."

Customer: "Oh! It works!"