Alien Mind Control

If we were grasshoppers, our body could be invaded by a thread-like alien species (whose length is many times longer than our body length), our mind could be controlled to committed suicide by plunging into the water to our destruction.

From 31 August 2005 NewScientist.com news service:

A parasitic worm that makes the grasshopper it invades jump into water and commit suicide does so by chemically influencing its brain, a study of the insects’ proteins reveal.

Since we are human, we only have to worry about the constant barrages of advertisements making us into docile consumers, doing destructive things to our bodies and souls.