i always open cameras whenpeople give them to me, whether they are full of film or not.
i LOVE pointing the opencamera to a light and clicking the shutter to see the blink.
when i go to a photo store that has film and paper, i always open the boxes and sleeves of paper
boxes of film ( and those annoying foil packets ) and sometimes pull some of the 35mm out of the cartridge.
to make sure the film and paper are in there, before i buy it, i don't want to get ripped off.
the guys that sell film and paper on ebay who have it all spread out, i am happy for that
because i always ask them to take a nice photograph of the film and paper before i buy it
sometimes i ask them to scan it to make sure it isn't all used up ... i don't want USED...