According to Slate.com:
Aristotle didn't have a high opinion of the octopus. "The octopus is a stupid creature," he wrote, "for it will approach a man's hand if it be lowered in the water."
Oh yeah, Aristotle? Can you open a mason jar with your tentacles and eat the crab inside like in this video (sucks to be the crab)? They've got half a billion neurons, which puts them on par with mammals and birds and Greek philosophers.
Thanks for the article, Ida.