Link: https://en.wikipedia.org/wiki/Kopi_luwak

I've actually tried this 15 years ago in the Mountain Province. I paid $3 for a cup because they make it there and it didn't have the tax and reputation it has now. It's good. Tastes like melted caramel.

There's an informative James Hoffman video about this.

Fraud is briefly discussed in the wikipedia page, but from the video, he's able to estimate that 75%+ of the coffee sold as kopi luwak isn't kopi luwak at all, it's just normal, cheaper coffee marked up a ton.

And of course, the remaining <25% that is real kopi luwak is ripe with civet abuse.

So please don't drink this coffee. If you're that interested in gut-processed coffee, do it yourself like that guy in Portland (but I still wouldn't recommend it).

I read a while back that there's nothing about the digestive process that makes the coffee taste good - the animals just pick the better fruits first.