We had a soda machine in High School in the early 80's that I could stick my arm up the chute and dislodge cans of soda 5-6 at a time, this went on for a couple weeks. The stock man must have caught on because the next time I tried, I got my arm stuck up there for a few minutes
trying to repeat the act unsuccessfully, must have rearrainged something. (I had skinny arms)