The Calimari Wrestler is out with his new girlfriend, when he's cold-cocked by a pugnacious crustacean: the Squilla Boxer, who issues a challenge. And that leads to the greatest squid-training-for-the-big-fight sequence in history, in the Japanese masterpiece, Calamari Wrestler.
I've watched Calamari Wrestler (aka Ika Resuraa) twice all the way through, including once on the big screen, and I'm still not entirely clear on what's supposed to be happening. But it's all so masterful, it just grips you in its firm tentacles and never lets go. And here's the "training for the big fight" montage I mentioned. Rocky's just a damp squib compared to this guy: