In 1995, the great Bill Watterson shut down his cartoon Calvin & Hobbes and retired. He's famously private. When Jake Rossen of Mental Floss landed an interview with him last year, it became a major news story.
It's unusual to see art made by Watterson after 1995. Pictured above is a promotional poster that he made for Stripped, a documentary about the past, present and future of cartooning. In the trailer embedded below, you can hear him, as well as other cartoonists, including Jim Davis (Garfield) and Matt Inman (The Oatmeal).