I have a couple personal rules with the internet. "Don't Google parasites" is top of the list. That search is always going to end in some ungodly long worm squirming out the butt of some helpless critter... Zombie fungus is an exception to the rule. It's in the same genus as the inspiration behind the fungus that affects Parasect. Ophiocordyceps. Really fascinating stuff. If you're brave, Google it!