I'm looking for this Italian film, probably from the '70s. I saw this in my youth but can't remember the title. It's a bit "meta"—the film is about a film in a cinema—a spaghetti western.
During one tense moment in the film-within-the-film, a member of the audience is shot dead, and it coincides with a shot being fired on the screen. The audience is kept from leaving by the police, and a reconstruction is staged, with a volunteer taking the victim's chair. During the exact same moment, the same thing happens again.
The film plays with the concept of reality versus fiction, blurring the lines between what happens on screen and in real life, creating a tense and suspenseful atmosphere.