The “Dance of Death” in The Seventh Seal (1957, dir. Ingmar Bergman)

“The final scene when Death dances off with the travelers was, as I said, shot at Hovs Hallar. We had packed up for the day because of an approaching storm. Suddenly, I caught sight of a strange cloud. [Cinematographer] Gunnar Fischer hastily set the camera back into place. Several of the actors had already returned to where we were staying, so a few grips and a couple of tourists danced in their place, having no idea what it was all about. The image that later became famous of the Dance of Death beneath the dark cloud was improvised in only a few minutes.

That’s how things can happen on the set. We made the film in thirty-five days.” 

– Ingmar Bergman, Images: My Life in Films