Luak coffee is one of those snicker-rich stories beloved of newspaper writers and party raconteurs. This gourmet curiosity consists (ostensibly) of coffee beans that have been excreted by a smallish animal called a luak or palm civet after the luak has consumed (and digested) the coffee fruit that previously enveloped those beans. Apparently villagers in parts of Sumatra both gather the beans from wild luak excrement as well as feed coffee fruit to luaks kept in cages.
Owing to a production method that is clearly limited in volume, Kopi Luak is a rare coffee that demands by far the highest price of any coffee on the world market -- currently around $300 per pound retail roasted.
Note that the luak-assisted method of picking and processing coffee is not so outlandish as it first may sound. Presumably the luak, like any good coffee picker, chooses only ripe coffee cherries to eat. And recall that in the classic wet method of coffee preparation, one step involves allowing natural enzymes and bacteria to literally ferment or digest much of the fruit from the beans.