In 1972, Jerry Lewis—the actor and filmmaker known for slapstick comedies like The Nutty Professor—took the biggest risk of his career when he decided to make a drama called The Day The Clown Cried, about a circus clown who ends up in Auschwitz. This could have been a landmark as one of the first portrayals of the Holocaust in American cinema. Instead, it became a different kind of landmark: allegedly, one of the worst movies ever.

The Day The Clown Cried was never released, and only a handful of people have ever seen it. But the unbelievable concept alone has been enough to make this lost movie a holy grail for curious film buffs. In this episode of Decoder Ring, producer Max Freedman traces how The Day The Clown Cried became such a legendary disaster, why it’s impossible to see, and whether it actually deserves its rotten reputation.

You’ll hear from comedian Patton Oswalt; Shawn Levy, author of King of Comedy: The Life and Art of Jerry Lewis; Henry Gonshak, author of Hollywood and the Holocaust; Chuck Denton, whose father Charles co-wrote The Day The Clown Cried; and Jean-Michel Frodon, film critic at slate.fr.

If you have any cultural mysteries you want us to decode, email us at DecoderRing@slate.com. Or you can also call us now at our new Decoder Ring hotline at 347-460-7281. We’d love to hear any and all of your ideas for the show.

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