Juicero: The $400 Juicer That Squeezed Pre-Made Juice Packets
Juicero raised $118 million to sell a $400 Wi-Fi-connected juicer. It collapsed after Bloomberg showed you could squeeze the juice packets by hand—faster than the machine.
Lesson: Always test your core value proposition against the simplest alternative. If a human hand can do what your machine does, you don't have a product.