Gaby got me “What’s Your Poo Telling You?: 2009 Daily Calendar.”  The item for this last weekend:

“In rare cases of intestinal obstruction, it is possible to vomit poo.  Most cases of bowel blockage occur in the small intestine (before poo is formed), but when the problem occurs in the large intestine and fecal matter cannot make its way out via the rectum, it travels in reverse into the upper GI tract and exits via the mouth.”

Freaking.  Gross.