Next month will be the 15th anniversary of the death of Bill Hicks, one of the greatest comic voices in American history. Here’s a clip of the last performance he ever did, while he was dying of pancreatic cancer. On Friday, David Letterman will finally show a set Hicks did on his show in 1993, a set that was cut out of the show because the producers thought it was too controversial. A lot of the material in that set is in this clip as well.