Web sites and books love to collect, for our entertainment, what are often called "loony" or "weird" or simply strange, unusual, peculiar or even bizarre laws. Which of these may be real but exaggerated and which are urban legends can be hard to determine, because they are almost never cited to their source. The urban legends site Snopes.com has a concise explanation of the problem on its Arizona Defense page.
One of the questions we get frequently is whether it is illegal to cross the Minnesota/Wisconsin border with a duck on your head. This question has been tackled by the Minnesota Lawyer Blog -- see If it quacks like a duck, it must be cotton fabric -- and Minnesota Public Radio -- see Quack. The following resources may help you run your own particular rumor to ground.