It isn't a joke. It's a very serious legal precedent that, if pushed hard enough, can go all the way to Supreme Court (which would most likely reject the case, letting the last decision stand). It is an excellent example of a serious issue with case-based law, as practiced within the U.S. It's a hack, and it's designed to demonstrate both the absurdity of the Supreme Court's decision when taken to a logical extreme, and the limitations of our legal system. It's also very clever. The fact that it is satirical in nature is only of cursory interest.