Butyric acid is found in butter, parmesan cheese, vomit, and as a product of anaerobic fermentation (including in the colon and as body odor). It has an unpleasant smell and acrid taste, with a sweetish aftertaste (similar to ether)
Source: wikipedia
...which I only mention because of this informative article on Hershey bars also from wikipedia.
A whole new meaning to bottom-feeders.
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