So go the opposite direction.
“Okay, okay, you’ve all succeeded in changing my mind. I should have my baby in two weeks.”
(Two weeks? But you’re not pregnant.)
“Nope. Don’t want to go through the birth thing. I made the arrangements over the internet.”
(Oh. You’re adopting.)
“Well, no, not adopting, exactly. I’ve heard too many horror stories about diseases and stuff, people trying to unload their flawed kids. You want a totally healthy white baby, you got to pay a premium.”
(Oh. Uh…)
“But I found this outfit out of Myanmar that says they can get healthy white babies at about two-thirds the cost of the usual places in Japan and Mexico. That’s where I’m going.”
(You’re messing with us. You’re not really buying a baby in Myanmar.)
“No, honestly, I really, seriously am going to the baby market in Myanmar. You all kept talking about it and talking about it and I changed my mind, so I’ll be going there in two weeks and picking up a baby. They promise they have at least a dozen to choose from at any one time. Well fed, clean, and a disease-free guarantee. You walk right up to the display tank, point at the one you want, and they dip it out for you with a big net. I can show you pictures and everything. They’re on a website.”
(There’s no way this is real.)
“Would I spend fifteen hundred dollars on a scam? I totally checked it out. Plus there’s a warranty, up to the first five years. You get your money back on a sliding scale if you decide you picked a bum tot. Say it turns out to be stupid or won’t stop crying or whatever. If it’s in the first year, you get a full refund. In the second year, you get twelve hundred dollars back. Third year, nine hundred. Down by three hundred bucks every year you have the baby until the end of five years. Then if you change your mind you’re out of luck.”
(Just stop.)
“No! It’s a great deal. They make it totally easy. I mean, I thought it was going to be a pain, y’know, trying to get my money back if the kid sucks; I figured I’d have to spend all this money to go back and return it, or to make a padded box with airholes and Doritos to ship the baby to Myanmar. But it turns out they don’t really care if they get the baby back. They just want to know you aren’t using it any more. So you just have to send them back the head.”
(That’s not funny.)
“It’s not supposed to be funny. It’s a totally great deal. I get a healthy white baby from Burmese slavers for fifteen hundred bucks, with a money back guarantee, and all of you losers get off my back about it. What’s not to love?”
The more inappropriate you can be, with the straightest possible face, the better. 