Mom- "What does this have to do with a zombie apocalypse and me?"
Me- "Well, you see, it is starting with ants, but will eventually move on to humans."
Mom- "Is this in the rainforest?"
Mom- "Well, that is why we are cutting it down. To destroy the zombie fungus."
I saw a piece recently on a parsasitic organism (i believe this one was a bacteria or other tiny micro-organism) that would cause a caterpillar to climb to the top of a tree and wave itself around to attract birds to come eat it because the next stage of the parasite's life cycle takes place in the bird's GI tract. There was another that would cause a caterpillar to use it's cocooning silk to instead attach itself to the top of a leaf in order to make itself a better growing medium for the fruiting parasitic fungus.
It's incredible how advanced these things can be. Makes you wonder what other kinds of weird stuff is out there still to be discovered...