"Purchasing, you know..." joke

A man goes into a drug store and asks the cashier for some rubbers. The
cashier asks, "What size?"
The man replies, "Size? I didn't know they came in sizes."
"Yes, they do," she says, "What size do you want?"
"Well, gee, I don't know," the man answers.
The lady is used to this, so she tells him to go to the back yard and
measure his dick by sticking it into each of the three holes in the fence.
While the man is back there, the lady sneaks around to the other side of the
fence and spreads her legs behind each hole as the man tests it. When the they
return, the cashier asks, "What will it be? Small, medium, or large?"
The man replies, "To hell with the rubbers, give me a hundred feet of
that fence back there!"
Chris Ott