The video, captured by the Monterey Bay Aquarium Research Institute, is a little dry (which is surprising for an underwater video! Hey-oh!) but if you wait about 1 minute into the video, you'll see the little gas-mustachioed crab:
You can almost hear him going, "What the!?!?" Luckily it looks like he can still move his mouth parts and has full use of his claws, so hopefully this has just taught him to be a little less adventurous when trying new foods.
PS - I'm not entirely sure, but I'm willing to bet that this guy is a Chionoecetes tanneri, or grooved Tanner crab. (Thanks for making me guess, MBARI! You know how I am with scientific names!) The clues? Thanks to my Biological Field Techniques for Chionoecetes Crabs (Jadamec et al., 1999), I first looked at the way the crab's sides jutted out.
We can tell that he's not Chionoecetes opilio or C. bairdi because his branchial region sticks out farther than the area below, called the lateral margin. Next, his carapace has a deep notch in the branchial ridge as opposed to a shallow one with a little spine in the middle on C. angulatus or a super shallow interspace on C. japanicus.
You can even make a T (for tanneri) by putting an imaginary line across the top of his branchial ridge:
What do you think? Either way, he's a cute crab with one heck of a story to tell his friends!
(Thanks to Ashwin Sreenivasan for the link!)