Finishing the shot and getting ready to fold the camera, removing the lens and then remembering you have not put the dark slide on the film holder yet......do this with a 12x20 so it really hurts...
Try to focus with the film holder in place and wondering why you cant see a thing...
Going from a B&W shot to a color shot and forgetting to remove the red filter.....
The possibilities to do something stupid are endless........
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