In Iceland, a hand-drawn map can get your mail delivered to the right address. Tourists who had visited a farm and mini zoo wanted to send a thank you postcard but forgot the address, so they drew a map of the area instead. It not only worked, but is not an uncommon occurrence in place where only 300,000 people live in an area the size of Ohio. Source
Someone in Russia also tried the map-drawing idea. It worked, too!