Via BoingBoing comes all of Title 17 of the United States Code, which encapsulates all of American copyright law, in short quartains with ABAB rhyming scheme. On 17 USC 107 (fair use):
Despite all of these rights
All people can reproduce
To report, criticise, or teach
Because that is fair use
Copyright 2006, Yehuda Berlinger. Permission is hereby granted to copy in part or in whole along with this notice, attribution, and a link back to this web site.