Before Steve Jobs was the serious, turtleneck-wearing CEO and co-founder of Apple, he was a young guy who would goof off, scheme elaborate pranks and go to concerts with friends.

According to Apple co-founder Steve Wozniak, Jobs' personality shifted once he became the founder of "a company with big money," Wozniak told Guy Kawasaki, who worked at Apple in the 1980s, on his podcast Guy Kawasaki's Remarkable People.