I had a mission companion who was a conspiracy theorist. "Cars could get 100 mpg, but the government puts microchips in them to keep the oil companies happy."
Now, I usually don't buy into conspiracy theories, but I have one of my own. Certain corporations are spying on my thoughts.
As a kid, I was deeply immersed in comic books. Whenever we had spare money, my friend Daniel and I would walk to the comic book store (sometimes a whopping 2 miles away!) and blow our wads. We each had our favorite characters, but sometimes we would make up superheros on our own. On multiple occasions, I would describe a character I had made up to Dan. I would talk about his powers, his costume, and what kind of hero he was (mythical like Thor, mutant like X-Men, alien like Superman, or created like Spider-Man).
Lo and behold, 3 weeks later, Marvel comics has a new superhero who is EXACTLY like the one I made up.
Other things I invented in my head before they became mainstream include: rollerblades, blogs, and portable mp3 players.
I gotta figure out how these corporations keep getting into my head... or maybe I'm just psychic...