Nerve endings in the rectum usually enable individuals to distinguish between flatus and feces, although loose stool can confuse the individual, occasionally resulting in accidental defecation also known as "wet farts", "sharting", "varting", "gambling and losing", "dookie fart", "Leaky Pete" or "following through". It is of course the "citation needed" that makes this such a winner. I can hear the wikipedant addressing wikitalk following his daily review of flatulence: "We're going to need a citation on 'Leaky Pete', folks. Can't let crap like that slip through."
(Yes, I know what you're thinking, but remember I have a three-week-old. What's YOUR excuse?)