Class Clown is not only George Carlin’s signature album—it’s also, probably, the funniest and most incisive one ever made about attending Catholic school in the classic catechism era. That’s the gist, anyway, of the three tracks that begin its second half: “I Used to Be Irish Catholic,” “The Confessional,” and the theologically logic-twisting “Special Dispensation: Heaven, Hell, Purgatory and Limbo.” Add the much-memorized “Seven Words You Can Never Say on Television” and you have a comedy album that will never wear out.