There is a woman who lives outside of Bukittinggi and produces kopi luwak, the most expensive coffee in the world. If you go to her house, she will give you a nice presentation about the coffee and show you the process, and you are also able to buy some. $2 for a cup (which is much more than the usual $0.20 in Indonesia) or $20 for a bag.
Why is kopi luwak so special? From Wikipedia:
It is made from the beans of coffee berries which have been eaten by the Asian Palm Civet (Paradoxurus hermaphroditus) and other related civets, then passed through its digestive tract. A civet eats the berries for their fleshy pulp. In its stomach, proteolytic enzymes seep into the beans, making shorter peptides and more free amino acids. Passing through a civet’s intestines the beans are then defecated, keeping their shape. After gathering, thorough washing, sun drying, light roasting and brewing, these beans yield an aromatic coffee with much less bitterness, widely noted as the most expensive coffee in the world.
The cat poop coffee was quite tasty, but I don’t know if it would be worth the $40 or so per cup it usually is in other countries.