Indeed, The "Best Amicus Brief Ever" (PJ O'Rourke Had A Hand In It)
Here, from David Lat at Above The Law, is a PJ O'Rourke gem from this First Amendment challenge to an Ohio law that makes it a crime to "disseminate a false statement concerning a candidate, either knowing the same to be false or with reckless disregard of whether it was false." An excerpt:

[W]here would we be without the knowledge that Democrats are pinko-communist flag-burners who want to tax churches and use the money to fund abortions so they can use the fetal stem cells to create pot-smoking lesbian ATF agents who will steal all the guns and invite the UN to take over America?

Voters have to decide whether we'd be better off electing Republicans, those hateful, assault-weapon-wielding maniacs who believe that George Washington and Jesus Christ incorporated the nation after a Gettysburg reenactment and that the only thing wrong with the death penalty is that it isn't administered quickly enough to secular-humanist professors of Chicano studies.

An amicus brief is a "friend of the court" brief, by somebody who is not a party to a case.

via @walterolson