It did happen to me once. I ran into a bad roll of Kodak film. It was the summer of 1982 and I had just put a roll of 126 in my X-15F, I was out doing my usual snapshots and noticed that the counter wasn't moving. Somehow the film wasn't attached to the take up spool. I put the film in an envelope with a hand written letter, a week later Kodak sent back a letter of apology and 2 cartridges of 24 exposure film. The one I sent them was a 12 exposure cartridge.