Google Maps is an invaluable tool for anyone who drives a car in a big city, offering details on traffic snarls or bottlenecks on major roads. A lot of us religiously check Google Maps before going anywhere, to properly plan our routes. Google itself runs ad campaigns encouraging users to do the same. But the system isn't foolproof and can be deceived, as hilariously demonstrated by a man in Berlin who used 99 smartphones and a hand cart to create ‘fake' traffic jams in the German capital.