Where did comedy come from? Where is it going? Comedy Central's acerbic ®Lewis Black takes US along for a raucous ride as he tries to find the world's funniest joke. Sitting down with the great comedians of yesterday, today and tomorrow, over 50 funny men and women reveal what makes them, and in the process, us, laugh! Join Lewis Black as he ponders these and other great mysteries of the comedy universe along with Dave Attell, George Carlin, Kathy Griffin, Robert Klein, George Lopez, Kathleen Madigan, Patton Oswalt, Penn & Teller, Robin Williams and many, many more comedy greats!