Octopodes - which is the correct plural of octopus, not octopi - are both beautiful, magnificent sea creatures and utterly, completely terrifying.
Seriously, they look like aliens and are capable of pretty much unrecognisable feats of gymnastics.
What do we mean? Simply put, an octopus is able to fit through any hole that the top of his tentacle is able to fit through.
That's right - an octopus can shrink and pull itself through the diameter of any opening that's the same size as one of its tentacles.
Don't believe us? This video shows what we mean.
It's amazing. And also super creepy.