This brings up a sad story from my old work. We had a coffee machine where you had 2 containers, one for the beans and one for the water, never had a problem w

This brings up a sad story from my old work. We had a coffee machine where you had 2 containers, one for the beans and one for the water, never had a problem with knowing which was which. But there was also a place to put in pre-ground coffee, which we never used. One day a consultant came along, and not being able to make coffee because the machine had run out of beans, they proceeded to pour beans into the space reserved for the pre-ground coffee. We found this out by the horrific gear crunching noise the machine had made as the coffee beans shredded the internals to bits. It was a disappointing and sad day for the engineers, many of whom were frequent coffee drinkers. Needless to say after the machine was repaired we taped that pre-ground coffee access port closed.