There is a strange Parasitic Fungus named Cordyceps. They attach their spores to ants, and it begins to disorient them, and control them, making them go crazy and wander from their trail. After a while, the cordyceps controls the ant to climb upwards on a limb of a tree, or on a plant, and forces the ant to close its pincers into the plant, and it dies. After a couple of hours, the ants head will erupt with his fungus. Its branch then spreads more spores on the ground to infect more ants. Could a fungus like this evolve to attach itself to humans and turn us all into flesh eating zombies? Its a possibility. That is the plot for the video game Fallout 3..... Coincidence? I think not.