A few days ago I was having some work done at my local garage. A women 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 a car just like hers which had its hood up and asked, 'Is there a 710 on this car?'
She pointed and said, 'Of course, its right there.' The mechanic was gobsmacked - she meant OIL because the cap was upside down, think about it - OIL, 710 !