5. Game Boy was invented by a janitor.

Okay, so that’s a slight overstatement, but it's not far off. Gunpei Yokoi was working maintenance on the assembly line in a Nintendo factory when company president Hiroshi Yamauchi came around. Yamauchi noticed a toy that Yokoi had built in his spare time. That toy became the Ultra Hand, a best seller for the company, and Yokoi moved from the assembly line to the design suite. Yokoi then turned a boring old calculator into Game & Watch, another huge best seller, and then created the Game Boy: the crown jewel of handheld gaming devices.