Steve Wozniak, aka Woz, was one of the co-founders of Apple back in 1976. When he left the company in 1987 (though he technically remains an employee to this day, drawing a nice salary), he needed something to do.
It's a scourge of junior high school students everywhere: Mononucleosis. The highly infectious disease is colloquially dubbed the "kissing disease". But that's not how Steve Jobs got it. He got it making a video game.