Viruses, bacteria, germs and all the disgusting microbes in the world.

So!
there once lived a little germ in a little world. It is an insignificant little being, but in its little way it can multiply to many other little beings of its own little species.
And!
it ended up fighting some of the noble white blood cells, causing such discomfort to the bigger-than-this-little-beings being.

Alright alright!
I'm too sick to continue.. jus gotta rest more i guess.