When I was younger I used to work in a store that did developing and printing.
We used to keep an old film under the counter, so when a potential victim came in with his roll of 35mm and ask for developing, we would bob down behind the counter , quickly swap our film for theirs , then proceed to pull the film from the roll , hold up to the light and ask them what they wanted doing with it.
It used to work a treat , some very irate customers 'til we spilled the beans!
Ah happy days.



