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Jeni and Kara

If you want to see rudeness in action, one of the best places to look is in the restaurants of America. Kara says she knows one of those rude customers personally—her sister Jeni is one of them!

"Anywhere we go out to eat, she refuses to sit at tables and she has to sit at a booth. And if they're really busy and she has to wait to sit at a booth, then she complains about having to wait to sit at the booth," Kara says. "If her water glass gets empty ... and they're not immediately there to refill her water, she gets really upset or won't leave a tip because they're not doing their job. And she orders iced tea a lot and she puts sweetener in her tea, and so it gets a certain amount of sweetener. And lots of times the waitress or waiter will come and top off the glass and she gets upset because now her sweetener-to-tea ratio is messed."

Jeni says she doesn't intend to be mean but isn't afraid to tell waiters when something is wrong. "Most of the time, I find something that's not correct," she says.