Sure, all of these useless inventions are just concepts, but you never know when one of them might hit an online retailer. Starting off, we have the X-Ray Watch, which comes complete with mint warmer, print / fax / printer machine, and instant notification of any fractures that may occur while wearing the device. Click here to see more. Continue reading to see the world’s most useless machine, which is a real product by the way.

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