When the Dallas Mavericks owner and entrepreneur asked his dad if he could get a new pair of expensive sneakers, his dad told him he could go get a job. So he did, selling garbage bags door-to-door.Cuban was 12 at the time, and he asked his dad how he was supposed to find a job. That’s when one of his dad’s friends stepped in. He said he had some garbage bags he needed to sell, so Cuban went door-to-door selling the bags for three dollars more than he paid for them.