Pepsi twice ended up in court after promotions went disastrously wrong. Other big companies have fallen into the same trap - promising customers rewards so generous that to fulfil the promise might mean corporate bankruptcy.Businesses and customers alike are sometimes blinded by the big numbers in such PR stunts - but it's usually the customers, not the businesses, who end up losing out.For a full list of show notes see http://timharford.com/See omnystudio.com/listener for privacy information.