What do Jon Stewart, Freddy Krueger, Patch Adams, and George W. Bush have in common? As Paul Lewis shows in Cracking Up, they are all among the ranks of joke tellers who aim to do much more than simply amuse. Exploring topics that range from the sadistic mockery of Abu Ghraib prison guards to New Age platitudes about the healing power of laughter, from jokes used to ridicule the possibility of global climate change to the heartwarming performances...