Tom Scott explains how terrifyingly dangerous human beings are, in the form of a educational safety video for interstellar travelers who aren't humans. - - Neatorama
The Narrator was MOST persuasive: he had a British accent.
Hitchhikers' Guide to The Galaxy.
Earth: Mostly harmless.
(It was an improvement over the earlier entry: Harmless.)
I don't claim originality here - but consider what aliens might think about Westerners at least. A race whose young males (and some females) spend half their waking hours for twenty years or more running combat simulations - for fun.