SMELLING A RAT
     Apparently flatulence (hydrogen sulfate) can kill, well in large quantities at least. It can be as lethal as cyanide if amplified by about one thousand. Hydrogen sulfate in such quantities can be found in some sewers and manure pits can cause suffocation. Hydrogen sulfate is a stealthy killer. Where its rotten egg smell can be painfully obvious at ten parts per million, any amount over one hundred fifty parts per million and it becomes unrecognizable because your olfactory nerves are paralyzed.

EATING BACKWARD
     The idea of of feeding "backward" or through rectum and other unsavory methods doesn't seem appealing, but is it even possible? The answer is questionable. One such way to accomplish backward feeding (although exceedingly outdated) is through "nutrient enemas." The basic idea is to deliver food to the colon through the rectum to be absorbed. The problem with this is that the colon isn't meant to absorb such things and often can't absorb a lot of what is needed to support a body. Another way of feeding backwards is something that animals like rabbits and mice do, eat their own excrete. This method however is actually effective for the animals because they revive essential vitamins and fatty acids manufactured by the bacteria inside their colon from the waste. Just picture the feces as a self made vitamin pill.