Genius McDonald’s hack guarantees a free cheeseburger in EVERY order

MCDONALD'S fans can nab a free cheeseburger with every single order if they use a "genius" little-known hack. The fast-food giant is known and loved for its menu classics, with the humble cheeseburger being a firm favourite worldwide. And it turns out there's an easy trick that can get McDonald's customers infinite free cheeseburgers. The...