Six Reasons the Blanket Octopus Is My Favorite Cephalopod (jellybiologist.com)

I feel like this is one Oatmeal comic away from internet fame. I can't think of any other source of viral Cephalopod memes. That is where I learned all about Tardigrades and Mantis Shrimp.

The one in the last video looks like it's swimming by flapping its arms. That's pretty nuts if it's not just for show.

Edit: if you like floofy cephalopods, you might enjoy this video of a dumbo octopus and some goofball scientists: https://youtu.be/GlvGCTpp1tM