Yesterday I was having some work done at the car dealer. A

 woman came in and asked for a seven-hundred-ten. They all looked    at

 each other, and the Mechanic asked, "What is a seven-hundred-ten?"

 She replied, "You know, the little piece in the middle of the engine.

 I lost it and need a new one. It had always been there."

The mechanic gave the woman a piece of paper and a pen and asked her

 to draw what the piece looked like. She drew a circle and in the

 middle of it wrote 710. He then took her over to another car which

 had the hood up and asked, "Is there a 710 on this car?" She pointed and

 said, "Of course, it's right there."

 Click here to learn the identity of the mysterious 710:

      http://www.mademelaugh.com/gfx/710.jpg