Once again, ThinkGeek comes up with a stellar product.  In this case, it is Weasel Puke Coffee, and it is no joke!  Basically, these weasels eat the best beans off the plant, but the beans irritate their stomach causing them to vomit.  Somehow their stomach acid affects the beans which are harvested by Vietnamese people and brewed into a drink which is treated as a delicacy.

There are weirder symbiotic relationships in nature.  I suppose they probably could have come up with a better name that is a little less descriptive.  Maybe it is lost in translation or something.

Update:

After posting this story, many people have mentioned to me that there is also Weasle Poop Coffee, which is definitely more disguting but, unfortunately, not for sale.