McDonald's is the world's most popular fast-food chain, with more than 68 million customers served each day in its thousands of restaurants across the globe. Ever since the company was founded in 1940, its reach has expanded exponentially, with stores in more than 100 countries
However, while McNugget and Big Mac connoisseurs may think they know everything there is to know about the Golden Arches, only McDonald's employees know the secrets about what goes on behind the counter