Mark Cuban discusses entrepreneurial spirit

Mavericks owner Mark Cuban will appear in a special sneak preview episode of "Shark Tank" (8 p.m. Sunday, ABC), a reality TV series about five "Sharks" who hear investment proposals and considers whether to invest in the business.

"I loved what they were doing and I thought it would be a good idea to go on," Cuban said. "I get pitched business proposals every day. People stop me on the streets. This is just part of my normal life."

Cuban said he started out poor when he began his entrepreneurial career, "eating mustard and ketchup sandwiches" and living with five other guys in 3-bedroom apartment. But he was committed to become a success, just like those he sees on the show.

"I would drive by expensive houses to get motivated. I would listen to motivational tapes," said Cuban, whose dad worked 11 hours a day as an automobile upholsterer. "When it comes to business, my best strength is my laser focus. It doesn't matter your background. It just depends on how hard you want to work."

For more on what Cuban had to say, click here.