9. Freaky ass giant octopus-like beasts
Octopi are terrifying. Why do they have all those arms? They don't need that many arms. Why so many arms?! Sure, a marine biologist could probably explain why they're actually majestic creatures who balance out Earth's ecosystem, enrich our understanding of the animal kingdom, and always remember to put the seat down, but that person clearly hasn't read The Call of Cthulhu. If these devil blobs ever learn to walk on land, we're totally screwed.
In fact, some scientists wouldn't be surprised if that has already happened. While it's possible that aliens on a planet like our own would develop much as human beings have, there's a chance that evolution could have taken a swift turn towards utter insanity, with "massive octopi with exoskeletons that've developed to walk on land."
I'm just going to throw this out there: maybe we should put SETI on hold for a little. You know, until we're sure we won't be ultimately enslaved by an army of Space Kraken.
Joe Oliveto is a staff writer for Supercompressor and he no longer wants to be an astronaut. Follow him on Twitter.
Want more of the world's best Tech delivered straight to your inbox? Click here to sign up for our daily email.