A blonde walked into an auto
accessory parts store and asked to purchase a "710 cover" for her car. The
clerk replied that he had never heard of a such a part. . She explained that her car had always had one since new, but she
noticed it was gone after the last servicing.
After spending an hour checking parts catalogues and
consulting with other staff members, one of the service agents asked her
to describe a 710 cover.
She held up her hands and made a circle about 2 ½ inches. He still didn't
understand, so patiently asked her to draw one. (By now, of course, several employees watching the proceedings.)
The woman drew a circle (with an edge like a flower) and wrote 710 inside
the circle. The employees standing at the opposite side of the
table started to laugh, then everyone joing in. Here's the
710 cover she drew.