A fellow was going on a tour of a factory that pro
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"The hiss is the rubber being injected into the mold," explained the guide. "The popping sound is a needle poking a hole in the end of the nipple."
Later, the tour reached the part of the factory where condoms were manufactured. The machine made a noise: "Hiss. Hiss. Hiss. Hiss-pop!"
"Wait a minute!" said the man taking the tour. "I understand what the 'hiss, hiss' is, but what's that 'pop!' every so often?"
"Oh, it's rather like the baby-bottle nipple machine," said the guide, "but here the needle pokes a hole in every fourth condom."
"Well, that can't be good for the condoms!"
"No," the guide said, "but it's great for the baby-bottle nipple business!"