In the print industry, practical jokes always abounded...when someone was away from their light table, they would often come back to find their rulers or other objects stuck to the glass with Spray Mount, or if they might find a jar of opaque (a black paint-like substance used to darken areas of film) tipped over with a large black puddle apparently spreading across the glass...only to find that the "puddle" was just a piece of black film cut out to look like one...my personal favorite was to catch a bug with a piece of tape, & attach it to the bottom of some woman's magnifying loupe...they would start back to work, look thru the lens, & see an insect magnified 10x...when I heard her scream, I knew I had done a good one...

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