Don't knock it until you've tried it
@Kenny Swan and everyone else who disses this just because it's weird.
Yes, it's weird, but actual food scientists have studied these "slightly used" beans and found that the partial digestion they receive changes the chemical makeup resulting in an actual better cup of coffee. Also, there's something about them that renders them more sterile than normal coffee beans.
See: http://www.uoguelph.ca/news/archives/002065.html for an example. Yes, they guy drank it and appreciated it.