This an interactive joke, so have a piece of paper and pen handy.

A blonde woman walks into an auto parts store and the parts man asks how she is doing and what can he do for her. She replies, "Fine, I need a seven-ten cap for my car." The man asks," A seven-ten cap? Where does it go, I've never heard of such a thing?"

The blonde angrily replies, "It goes on top of the engine and don't think just because I'm blonde I don't know what I'm talking about!!" Perplexed, the parts man asks if she would draw him a picture and maybe help him out in figuring out what it is she needs.

Reader: Draw the number 710 in the middle of the paper and draw a circle around the whole number. Now turn the paper upside down.