BBC host Steve Backshall grapples with a fearsome Humboldt Squid in this clip from the BBC nature series Deadly 60. One of the largest squid species, Humboldt Squid are notorious for their aggressive behavior against other sea creatures and even humans. Here’s a description of how Humboldt Squid attack their prey, via Wikipedia:
They often approach prey quickly with all ten appendages extended forward in a cone-like shape. Upon reaching striking distance, they will open their eight swimming and grasping arms, and extend two long tentacles covered in sharp ‘teeth’, grabbing their prey and pulling it back towards a parrot-like beak, which can easily cause serious lacerations to human flesh. The whole process takes place in seconds.
via The Awesomer