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Customers have called it the ‘world’s rudest restaurant’, but the success of Sydney’s Karen’s Diner has taken even its owners by surprise. It started as a pop-up restaurant during Australia’s Covid-19 lockdown, becoming a viral sensation on social media, and now it’s opening new branches across the world. The waiting staff are actors, trained to be as ‘rude’ as possible. The BBC’s Jacqui Wakefield visited…