Well I thought that I had learned about all the weird film formats, but here's one I had no knowledge of. Its called the Harper 16mm films system which is kind of like a double run system where frames are printed alternately , so that when the projectionist gets to the end of the reel in one direction he just throws the projector in reverse and the film is rewound while projecting. The film used a 35mm optical sound track printed onto 16mm film!
https://www.youtube.com/watch?v=gDAo5I7x5qM
https://www.youtube.com/watch?v=gDAo5I7x5qM
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