Mr. Warmth: The Don Rickles Project is now airing on HBO. This portrait of Don Rickles was directed by John Landis and produced by DH Entertainment. It is on rotation on HBO and is available anytime through on-demand.

The Merchant of Venom. The King of Zing. Mr. Warmth. Don Rickles has earned these nicknames for his incomparable ability to make insults seem endearing--and to make audiences laugh at each other and themselves. Renowned filmmaker John Landis takes a loving look at the comedy legend who is the last of Las Vegas' great Golden Age entertainers. The show features never-before-seen concert footage of his Vegas act, plus behind-the-scenes conversations with Rickles, interviews with many of his closest friends, and a wealth of memorable TV and film clips.

For someone who's spent a lifetime laughing about people, golden-age comic Don Rickles has sure made a lot of friends. From Robin Williams and Chris Rock to Clint Eastwood and Sidney Poitier, a host of Hollywood stars step up in 'Mr. Warmth: The Don Rickles Project' to celebrate this comedic legend in his own time. John Landis--the director behind 'Animal House' and 'The Blues Brothers'--first met Rickles on a shoot as an 18-year-old gofer. Now, decades later, Landis shows the warm heart behind this famously cantankerous on-stage personality.