The idiom the straw that broke the camel's back is from an Arabic proverb about how a camel is loaded beyond its capacity to move or stand. This is a reference to any process by which cataclysmic failure (a broken back) is achieved by a seemingly inconsequential addition, a single straw. This also gives rise to the phrase "the last/final straw", used when something is deemed to be the last in a line of unacceptable occurrences. Variations include "the straw that broke the donkey's back", the "melon that broke the monkey's back", the "feather that broke the camel's back", and the "straw that broke the horse's back".