This is a video of a giant Pacific octopus latching onto the head of a diver and the struggle to remove the animal. I'd say that diver got just a little too curious. And you know what they say about curiosity, don't you? "It killed the cat?" Well sure that too but I meant don't ever open the shoebox under my bed.
Keep going for the video.
Thanks to Yo, who informed me he's a diver himself and this is not an experience you hope for.