Here is the problem: for many years, the Supreme Court wrestled with
the issue of pornography, until finally Associate Justice John Paul
Stevens came up with the famous quotation about how he couldn't define
pornography, but he knew it when he saw it. So for a while, the
court's policy was to have all the suspected pornography trucked to
Justice Stevens' house, where he would look it over. "Nope, this isn't
it," he'd say. "Bring some more." This went on until one morning when
his housekeeper found him trapped in the recreation room under an
enormous mound of rubberized implements, and the court had to issue a
ruling stating that it didn't know what the hell pornography was except
that it was illegal and everybody should stop badgering the court about
it because the court was going to take a nap.
-- Dave Barry, "Pornography"