Amazon Fire Phone

The Amazon Fire Phone’s killer feature was "Dynamic Perspective"—a 3D effect using four front-facing cameras that caused motion sickness and drained the battery in hours. Jeff Bezos personally drove development, but the phone launched at $199 with a contract in July 2014 and was marked down to $0.99 by September. Amazon took a $170 million writedown, and the Fire Phone lasted exactly one generation—30% faster to price collapse than the typical failed smartphone. It proved that being good at selling books doesn't translate to smartphone design, with sales falling 99.5% from launch price in just two months.