The most strangest coffee (and also the most expensive one.....) is Kopi Luwak (Luwak Coffee). It came from civet's dung. WHAT...???? Yes...I write it correctly : it came from civet's dung / feces. Before you get fainted, let's see why Kopi Luwak can become the most expensive coffee in the world.
Kopi Luwak has been known as the tastiest coffee in the world since 1950. At that time, Holland (who conquered Indonesia that time) opened coffee plantation in a lot of places in Indonesia. When the coffee was ready for harvesting, there are a lot of pest destroying the coffee. One of the most dangerous pest is civet (Paradoxorus hermaproditus or "Luwak" in Indonesia).The civet eat the coffee's berries for their fleshy pulp. Later on, the bean are defecated, but still in their shape. After gathering, thorough washing, sun drying, light roasting, and brewing, the beans yield an aromatic coffee with much less bitterness.
Prof. Massimo Marcone from Guelpg University, Canada, had observed the Luwak Coffee and found out that the civet's endogenous digestive secretions seep into the coffee beans. These secretions carry proteolytic enzymes, which break down the bean's proteins, yielding shorter peptides and more free amino acids. This is the reason why the coffee has less bitterness than regular coffee.
Recently, Kopi Luwak is claimed as the most expensive coffee in the world, selling between US$ 100 - 600 per gram. The rarity of the coffee has make it sold in quiet outrageous price. It sold mainly in Japan and United Stated.