I just thought of another one:
When I was in my 20s, I had a friend who did NOT plan to have children -- didn't want them, ever, never. Children? Not a good choice for her and her husband. They weren't the nurturing parenting type, but instead they preferred to lavish all their attention on one another and spend their evenings and weekends drinking and partying. He had a child from a previous marriage, and it was a trainwreck all around: the child didn't like coming to thier house, she hated being a step-mom, and dad was rather lukewarm towards the child. She told me at least 1000 times that she didn't want to be pregnant -- ever -- because she thought it'd be really gross to grow fat and "out of control" of your body. She seemed fearful about the idea of being pregnant. She also had some serious medical issues, so pregnancy would've been dangerous for her. On top of all that, they were really, really bad with money. Bottom line: it was a good thing that these two had already made a "no child" commitment to one another.
So, enough about their background, on with the really outrageous thing they did: They hit a rough patch financially -- well, more rough than usual -- and she decided to save $20-30 per month by STOPPING BIRTH CONTROL PILLS! She figured that if she got pregnant, she'd just deal with having a baby she didn't want.
I tried to point out to her that birth control pills were something she couldn't afford NOT to buy, but she wouldn't hear it. Her doctor'd told her that IF she ever wanted to get pregnant, it'd be difficult for her, so it's not quite as bad as it would've been for the average person . . . still, to take a chance with conceiving a baby that you adamantly do not want . . . it's beyond reprehensible.
I wondered if she secretly had decided that she wanted a baby, but as I talked to her about that, I don't think that was the case. I don't think she was trying to catch her husband with a "surprise". I think she genuinely thought, "Hey, this is a place I can save $20-30 per month."
This couple moved across the country, and I lost track of them. As far as I know, she hadn't become pregnant. I hope her luck held out. Idiot.