You may, or may not have heard this.....
A woman goes into a car spares shop and asks if they have such a thing as a 710 cap.
The guy behind the counter shook his head. He had never heard of such a thing...
He asked her whereabouts on the car this cap sits. The woman told him that it is on the engine, except that hers is now missing.
The guy still mystified, called a mechanic in and asked him. The mechanic listened and after asking what car it was, produced one from a box under the counter...
After the woman had left, the guy asked the mechanic, "what exactly is a 710 cap?"
The mechanic wrote it on a piece of paper "710." Then turned it round....
