The island of Svalbard off the coast of Norway is one of the more interesting examples. Popular with nature tourists for its beautiful landscapes, Svalbard is also popular with polar bears. Although citizens and visitors aren't allowed to hunt or otherwise actively harm the bears, killing them in self defense is allowed. In fact, every person venturing outside the city must carry a rifle for protection!
Another town with an interesting, if less deadly, law is Churchill, Manitoba. Churchill is the only town where it's illegal to lock your doors. The reasoning behind this strange law is simple: when you're being chased by a hungry polar bear, a car is an excellent place to hide!
