No one sets out to make a dystopia, but there are some futuristic inventions that seem ripe for unintended consequences. So set aside that killer robot you've been putting together in your garage and for goodness sake halt your lab work on that food replacement pill, and tell us about your own personal tech nightmares.
Explain in the comments first what the invention is and what about it spooks you the most. Be sure to sketch out just why it is that you hope it never makes it out of the design phase.
Image: Back to the Future's unsettling look at a possible future for pizza delivery.