Later, the tour reaches the part of the factory where condoms are manufactured. The machine makes a "Hiss. Hiss. Hiss. Hiss-pop" noise.
"Wait a minute!" says the man taking the tour. "I understand what the 'hiss, hiss,' is, but what's that 'pop' every so often?"
"Oh, it's just the same as in the baby-bottle nipple machine," says the guide. It pokes a hole in every fourth condom."
"Well, that can't be good for the condoms!"
"Yeah, but it's great for the baby-bottle nipple business!"