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, it's right
there."
If you're not sure what a 710 is click here:
http://www.hotautoweb.com/cogifs/710.jpg