Comedian and former host of NBC's "The Tonight Show" Jay Leno .

From the moment he entered the working world, "I always had two incomes," he explains to CNBC. "I'd bank one and I'd spend one."

And he made sure to spend the smaller amount.

"When I was younger, I would always save the money I made working at the car dealership and I would spend the money I made as a comedian," he says. "When I started to get a bit famous, the money I was making as a comedian was way more than the money I was making at the car dealership, so I would bank that and spend the car dealership money."