Yep - This is one of the strangest ones out there - here's what I've got:
STRONGYLOIDES STERCORALIS – this is the most unusual of all of the parasites known to man. They can live with or without a host. The females can reproduce without a male. They infect the skin, then migrate to the lungs where they are coughed up and swallowed by the host. They then settle into the small intestine where they mature and reproduce.