Conspiracy theories were once the bizarre lunatic ramblings of a very few isolated loons. Today, thanks to the internet these people can communicate with each other and so publicise their paranoia so that all of us probably know one or two people who strongly believe implausible notions. I'm not going to go into a list of conspiracy theories here but you will all be familiar with what I'm talking about.
Recently I came across a new one. I was at a party and heard someone holding forth some of the well established nonsense about "Big Pharma" There was the usual stuff. The pharmaceutical companies are paying doctors to prescribe their drugs, cancer cures are known but hidden so that cancer can be kept going as a cash cow, and then came an assertion, stated with absolute conviction that caused even cynical old DZ jaw to drop to it's anatomical limit. As proof that cancer cures are known but suppressed he said "Have you ever noticed that rich people don't get cancer." Fortunately the young lady he was boring came back with the perfect response. "Really, what about Steve Jobs"