a film editor instructor liked to rag on director's wanting a frame clipped here or lengthened there, arguing they couldn't possibly know when something was a s

a film editor instructor liked to rag on director's wanting a frame clipped here or lengthened there, arguing they couldn't possibly know when something was a single frame too long or too short. He would solve this by hitting a few keys on the keyboard that effectively did nothing, then show the director the same cut. Inevitably they would always remark how much better it felt, not realizing no change was made.