My father often found cinema-going a challenge. Most of the audience would be enjoying the movie, while he would be distracted by hard to detect emulsion scratches and slight variations in colour-balance as the film transitioned from reel-to-reel.

And when the theatre showed a print that ought to have been retired a few (or more) screenings earlier - it would drive him nuts!

All that from spending his days helping Kodak customers with, inter alia, their Single 8/Double 8/Super 8/16mm movies.