Stock Photo - 25 May 2022, Australia, Sydney: In the window of Karen's Diner, a sign explains the rules of conduct: ""Sit down and shut up."" Restaurants usually pride themselves on good service. Not so at Australia's Karen's Diner: Here, guests are mobbed and served extra badly. The curious concept is so well received that the chain is now expanding worldwide. (to dpa ""Rude waiters as a recipe for success: Karen's Diner conquers Australia"") Photo: Carola Frentzen/dpa. - Sydney/New South Wales/Australia

Stock Photo: 25 May 2022, Australia, Sydney: In the window of Karen's Diner, a sign explains the rules of conduct: ""Sit down and shut up.

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