The Simpsons: 30 Greatest Ever Opening Credits Gags

By Lottie Oram /

18. Duffman Is Mark Twain

All Duffman needed was a fine set of moustaches and the transformation into beloved literary figure was complete. Imagine the performance: it's just the most ludicrous thing imaginable. First aired: December 4 2011 Episode: The Ten-Per-Cent Solution