2 items
The grey brick: four AA batteries, a pea-green screen you had to angle toward a lamp, and Tetris in the box. It was outgunned on paper by every colour handheld it faced, and it buried all of them. Nintendo kept the line it started alive until 2003.
Nintendo's red-and-black 3D machine that sat on a table and asked you to press your face into it. It was on sale in Japan for about five months and in America for about a year, and it is the lowest-selling standalone console Nintendo ever put its name on. Everyone remembers the demo unit at the toy store, and everyone remembers the headache.