3. Mattel Aquarius (1983)
Joke. That, in a word, was the Aquarius computing experience. Toy kingpin Mattel's home PC had a gummy keyboard with an abysmal, bouncy feel. And any time a keyboard includes a tiny space key instead of a full-size spacebar — and places it where a Shift key might go — you know its designers were asleep at the wheel. But Mattel went further, including a cleverly placed Reset key that users could accidentally strike while programming, wiping out hours of work. Add to that the dubious positioning of the Return key, and you have one of the worst keyboards ever — on one of the worst computers ever.