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, confused, and another customer 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..." She said that she didn't know exactly what it was, but this piece had always been there and looked important.
Confused, 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. Still didn't get it. 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, "Yes of course, it's right there."