Nick Cannon is doing just fine for himself. He's a radio host, actor, TV personality, is married to Mariah Carey and he also happens to be a TV exec. But there was a time when money didn't come easily to him: He had to get a job during in high school to help his family out. It's just too bad he was too focused on being an entertainer to keep it for very long.

"When I was 17, we weren't doing that well financially," Cannon, who now has a very good work ethic, says in this week's episode of "When I Was 17" (airing Saturday at 11 a.m. ET), which also features [article id="1641188"]Aubrey O'Day[/article] and [article id="1641093"]Donald Trump[/article]. "And my mother, at the time, was working extremely hard. She was going to school. She had a couple of jobs."

In order to take some of the pressure off Mama Cannon, she asked her son to pitch in. And he tried.

"My mother made me get a job at, like, Wienerschnitzel," he recalls in the episode. "[It was a job] just to kind of help ends meet. I ended up getting fired."

Why was Cannon fired? Well, he was practicing for his future career. "I ended up getting fired because I was playing on the intercom system at the drive-thru, telling jokes," he explains. "That's when I knew I wanted to be a stand-up comic."

"When I Was 17" -- this week featuring Donald Trump, Nick Cannon and Aubrey O'Day -- airs Saturday at 11 a.m. on MTV.