Even if you put nothing else in it:

http://www.wired.com/science/discove...7-10/st_coffee

Quote of note: "Putrescine: Ever wonder what makes spoiled meat so
poisonous? Here you go. Ptomaines like putrescine are produced when E.
coli bacteria in the meat break down amino acids. Naturally present in
coffee beans, it smells, as you might guess from the name, like
Satan's outhouse."
--

modom