There’s been a quote going around attributed to Robin Williams that goes as follows: “You’re only given a little spark of madness. You mustn’t lose it.” Here’s where it came from. He was performing at the Roxy in 1978 for a brand new comedy special on a little known network called HBO. In the audience were a surprising group of people. Henry Winkler (The Fonz), Tony Danza before he was famous, and even John Ritter, who does a weird round of improv with Williams at the end of the video.