Yesterday I had dinner at El Escarpín, between Sol and Ópera.
I highly recommend it. The barmaid is friendly and gives big tapas to anyone who walks in with a smile. The best thing, though, is the tank of lobsters and crabs. I had more than an hour, over garlic soup, steak, wine and orujo to observe crustacean behavior.
Let me tell you, lobsters are just like people: there are lobster assholes, and then the poor bastards who have to put up with them.
P.S. Ten years after writing this, I heard Jordan Peterson talk about lobster social hierarchies. Guess I was ahead of the curve.