At what point is it acceptable for comedians to take on the most serious of topics and how does one comedian make us laugh while another falls flat on his or her face? Mel Brooks, Larry Charles, Sacha Baron Cohen, Sarah Silverman, Ricky Gervais, Etgar Keret, Joan Rivers and a host of other top comedians star in this fascinating film about the boundaries between humour and taboo subjects including the Holocaust and antisemitism. This is an engrossing and hilarious exploration of an important and ever-relevant topic.