It sounds unbelievable, but in the Brazilian rain forest there is a kind of fungus, that infests ants and effectively takes over their brain. You can see it in the picture, growing out of the ant's head. It literally takes control of the ant's body and basically uses it as a mode of transport to a location that is to its liking. There it will kill the ant and live a happy fungus life.
It has been found hat there are, in fact, 4 species of fungi which exhibit this kind of behaviour. My friends, methinks the end is nigh.