If you are squeamish about where your food comes from, you might want to skip this post. On the other hand, if you are ignorant as to where it comes from, then you should definitely read on.
I previously did a three-part series about crabs - how to catch 'em and cook 'em. In the last part of the series I talked about how to kill and clean them, but didn't provide much visual guidance. Here I will correct that oversight.
Here is a freshly caught and very much alive rock crab. I have flipped him onto his back (and that is the correct pronoun - he is a male. See the narrow, pointed plate centered on his abdomen? If he were a female, it would be broad and almost rounded). When approaching a crab to do this flip, always, always grab him from the back. He can't reach you there with his pinchers (but he will certainly try!). Once on his back he will settle right down, and often fold his legs up as if he were asleep.To cause instantaneous death, hit the crab firmly with something hard right on that central plate. Here I am using Death Bringer (which sometimes also serves as a winch handle on Eolian). Not only will the crab die instantly, but you will also have broken the main body plate (underneath the tringular one) in two - a necessity for the next step.
Now, right into the steam bath with those legs, and get the butter melting!