Interesting Thread on Cymothoa exigua (tongue-eating louse)

Damn, that is like something out of a horror movie. There is some crazy stuff in this world.

Reminds me of reading about the Candiru (Toothpick fish).
This thing follows your urine stream up when you pee in the water.

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When the candirú successfully invades a human, it proceeds exactly as it would with a fish host. After entering the misidentified orifice, it quickly wriggles its way in as far as possible, often accompanied by the victim's frantic attempts to grip the slippery, mucus-coated tail. In the unlikely event that the panicked victim manages to grasp the fish, its backwards-pointing barbs would cause excruciating pain at each pull, and bring a quick end to the dramatic tug-of-war. Once inside, the parasite inches its way up the urethra to the nearest blood-gorged membrane, extends its spines into the surrounding tissue, and starts feasting.

For the candirú, this misguided journey is a one-way trip; its bloody banquet leaves it too swollen to escape. The only known retaliation against the invader is delicate and expensive surgery, or failing that, a folk remedy which combines two herbs to very slowly kill and dissolve the fish. Silvio was fortunate enough to have access to modern medical facilities, though he had to endure three days of profound agony before the fish was extracted by an awestruck urogenital surgeon.

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Silvio Barbossa was one such soul. He was swimming in the Amazon River when he went head to head with the tiny parasite:

"I felt like urinating. I stood up, and it was then it attacked me. The candirú attacked me. [...] When I saw it, I was terrified. I grabbed it quickly so it couldn't go deeper inside. I could only see the end of its tail flapping. I tried to grab it, but it slipped away from me and went in. [...] I was very afraid, because the candirú bites."

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Toothpick Fish

I could have gone all my life without seeing that and been just fine.