A few days ago I was having some work done at my local garage. A blonde
came in and asked for a seven-hundred-ten.

We all looked at each other and another customer asked, "What is a
seven-hundred-ten?"

She replied, "You know, the little piece in the middle of the engine, I
have lost it and need a new one.."

She replied that she did not know exactly what it was, but this piece
had always been there.

The mechanic gave her 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 its hood up and asked "is there a 710 on
this car?"

She pointed and said, "Of course, its right there."

If you're not sure what a 710 is Click Here

http://www.hotautoweb.com/cogifs/710.jpg