The headless chicken monster sea cucumber has been recorded on video for the first time in the Antarctic oceans. Video of it is in the article. It is actually very cute, not monstrous. 'Headless chicken monster': deep-sea cucumber seen in Southern Ocean for first time
I think that's the weirdest common name I've ever seen. Quite a long mouthful too, "headless chicken monster sea cucumber." Was expecting it to look a little more like the crazy namesake, though I could see it a little.