Weasel Coffee in Vietnam.

"For the truly adventurous, there is the infamous ca phe chon, weasel coffee, which is exactly what it sounds like. Growers take the best beans from each crop, and feed them to a weasel. The weasel does what comes naturally, the beans are collected at his other end, then ground and brewed as usual. Apparently, the weasel's digestive system does something mysterious to the beans which makes them smoother and tastier than any other kind of coffee."

I found the Trung Nguyen branded weasel coffee in the States at Ranch 99
Market. It is not always available at the Ranch 99 stores. I googled and found them here., they called them Legendee at about $16.95 a pound. My wife is addicted to weasel coffee, so I'm glad to find them online now.