In an email with the apt subject line of "Gah!", my friend Heather sent me a link to a post in Wired's "Geekdad." The post is titled "When nature is freakier than science fiction." In it, the blogger lists three freaky animals.
The third one is your new least favorite thing ever.
Proving that, while she is the generous and bountiful source of all, Mother Nature is also a bit of a sadistic freak, I give you the "unnamed parasitic isopod."
Here's the description:
Finally, fishermen off the northern coast of France have found a large parasitic isopod (a relative of the louse) that has evolved a rather hideous method for survival in its host: It gets into the fish’s mouth and then devours its tongue. It then attaches itself at the back of the fish’s throat where it presumably feeds of whatever the fish normally eats. The really bizarre part is that the fish doesn’t seem to suffer any ill effects other than the loss of its tongue.
The weaver fish's f-ed up human-like teeth just add to the omfg-ness of the whole thing.