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TRUE CONFESSIONS ON "20/20"

Airs on Friday, September 12 on ABC

Get ready for another big dose of shocking disclosures� from auto mechanics to cosmetics saleswomen to baristas, the people in your neighborhood reveal some surprising secrets of their trade. "20/20" airs FRIDAY, SEPTEMBER 12 (10:01-11:00 pm ET) on the ABC Television Network. Reports include:

· The former executive chef of disgraced Virginia Governor Bob McDonnell dishes on what life was like behind the doors of the Governor's mansion. From claims of First Lady Maureen McDonnell's frequent verbal abuse, to the improper relationship the McDonnell's had with the wealthy businessman who lavished them with gifts and loans in exchange for preferential treatment, that ultimately ended in corruption charges, no topic is off limits. Amy Robach reports.

· "Joe the Mechanic," a 40-year veteran, shares some of the secrets about auto-repair� everything from secret billing codes like "gravy work," to the "water flush," to the so-called "idiot light." Joe exposes the ways some unscrupulous shop owners try to hose customers with unnecessary repairs and, in some cases, charge for work they did not even perform. "20/20" then tests some of Joe's assertions with a hidden camera investigation. Gio Benitez reports.

· Shaina Azad is a former cosmetic saleswoman who says she has exaggerated the benefits of products to get customers to purchase what she is pushing. "20/20" sets up its own shopping mall kiosk and hidden cameras - while Azad shows off the tried and true sales tactics that make anyone believe beauty can begin with a bottle. Will customers take the bait? Rebecca Jarvis reports.

· Some debt collectors are leaving threatening messages that are sometimes so outrageous, they sound like pranks. But they are very real. And with 30 million people in collection or about to be, there is enormous pressure on the 150,000 collectors - working hard to get back America's unpaid debt. One woman was so terrorized by the tactics employed by the collector, she sued him. In an ironic twist, a judge awarded her more than $30,000. Now if she can only collect on the collector. "20/20" pays a visit to the man behind the tormenting messages. Jarvis reports.

· Coffee - the most valuable traded commodity on earth after oil. The average American worker spends $1,000 on it every year. Have you ever wondered what that beleaguered barista preparing your morning brew is thinking? Nick Watt talks to a bona fide Starbucks barista who spills the beans on what happens when a customer comes to the counter with an attitude.

"20/20" is anchored by Elizabeth Vargas and David Muir. David Sloan is senior executive producer.