Lurking within the streams and lakes of sub-Saharan Africa is a parasite that has a particularly nasty way of leaving the human body. If you drink unfiltered water where the parasite resides, it makes its way into your abdomen and sets up shop. Once it is ready to leave, it heads for a foot - ready to depart in a gross, but awesome way.

Dracunculiasis medinensis, this is your life.