Octopi

Octopi are cephalopods with eight tentacles and big, ass-shaped heads that shoot black ink out of their butts. The singular form of octopi is octopus.

By and large, octopi are relatively harmless, but every now and again you may come across a pissy, over-sized octopus who is just damned and determined to cause trouble. Who can forget the gigantic octopus that wreaked havoc on the Golden Gate Bridge in the 1955 b-movie classic It Came from Beneath the Sea.

Octopi can often be tricky. Most people feel safe in the fact that they are strictly marine-based life forms, but every once in a while a rogue mountain octopus might suddenly appear to cause some trouble. Don't believe me? This is exactly what happened to the teenage mutant Furankenshutain in the international release of the 1965 Frankenstein Conquers the World, in which a giant octopus scales the side of a mountain peak and grapples with the monster until they both topple over into the sea.

There is a rather well-known Spider-Man villain named Doctor Octopus, or "Doc Ock", who patterns himself after an octopus. In addition to his two human arms, he also has four mechanical arms attached to a harness. Yeah, I know. The math doesn't work. It still only equals six limbs. Maybe their counting his legs as well.