Interstellar and the end of the film era
Today, nearly all movie theaters have converted their projectors to fully digital systems. Although movie theater 4K (4096 x 2160) is a little higher resolution than consumer TV 4K (3840 x 2160) - and definitely an improvement over standard HD (1920 x 1080) - nothing can match the resolution and shear awesomeness of 70mm IMAX film projection. Christopher Nolan is one of the last true film holdouts and with his new movie Interstellar, is pushing for the full "film only" versions to be shown across IMAX theaters.Bottom line: this is one movie you probably want to see in the theater. Otherwise you won't get to see its true glory until 30 years from now when the industry starts selling 32K resolution digital TVs.
The best/scariest though was in high school history. We were watching a film on concentration camps, when the projector screwed up and the beam of light projected on a single frame for an extended period of time was so intense that it burned a whole through the film, starting a fire. Its like the horrible images of what man did to his fellow man were so evil that they burst into flames. And of course, we thought it was a special effect in the film. So we sat there for a while before it was apparent that the projector was in full blaze and the room was full of smoke.