When I worked as a sales associate at ACE hardware customers would often come in and ask for some tubing. I would ask what kind and i would list off the types we had available. I'd usually try to sneak in fallopian tubing and it would go unnoticed at first and the customer would realize what i said and say, "wait, isn't fallopian tubing the..."
"Vagina tubing, yes" I'd interject.
And we both would laugh. I'd lean back laughing uproariously and pat my belly and he would double over with a mighty guffaw and slap his knee.
He would then ask for about 10 feet, because it is hard to find fallopian tubing up for sale these days and you need to stock pile when you can.