ABCNEWS.com : Utah Restaurant Bets on Honesty:

"Restaurant on Honor System Bets Honesty Can Boost Bottom Line

One World Cafe owner/chef Denise Cerreta ditched fixed prices for the honor system a year ago, and her social experiment is on the verge of showing a profit.
'It's between you and the box,' Cerreta said of a money chest that sits next to a water jug and mugs on a serving table. 'We continue to grow. We continue to make money.'"