Most disgusting parasites This parasite bites off a fish's tongue, then sits in the fish's mouth as a replacement tongue. How would you like a crustacean pooping in your mouth and drinking your blood, never mind the tongue thing http://www.amonline.net.au/fishes/faq/tongue.htm This is the worst one. Swims up your urethra then.... eh, read it for yourself. http://www.angelfire.com/mo2/animals1/catfish/candiru.html Here's a challenge: got any parasites more disgusting than these? Think of this as "battlelinks" or something.