The other day, I came across information about a specific parasite, called Sacculina, that essentially latches onto certain crabs and rewires them, changing behavior, physical appearance and essential converting the crab in question into a vehicle for the parasite, or zombie. It seems to remind me quite a bit of the behavior of Headcrabs and the way they take over human bodies for their own means of survival (Unless there is a crowbar lying around).
What do you guys think?
https://www.damninteresting.com/body-snatching-barnacles-and-zombie-crabs
https://boingboing.net/2009/04/16/sacculina-are-pretty.html
https://en.wikipedia.org/wiki/Sacculina
https://www.electroherbalism.com/Naturopathy/MiscAltHealthTopics/Parasites/DoParasitesRule.htm