i like how Mike Judge found the stupidest looking shoes he could find, from a new niche shoe company. These will never take off, he thinks; they're too hideous. So he puts everyone in crocs and chortles to himself. And then, 20 years later ...
lead in gasoline caused lead poisoning, leading to an increase in violent crime. now most fuel is unleaded, reducing the incidence of lead poisoning, and leading directly to a decrease in violent crime
they don't need to know they're pregnant, the body has ways of shutting that down