Vast, dense swarms of migrating squid, all swirling about a boat. How can the sailors resist leaping into the water with them?
I'm picturing millions of tiny beaks, each taking a tiny nip, and millions of tentacles, each stroking and rasping away a thin layer of skin, all in endless succession. And then as the blood painted the waters, a boiling, roiling mass would heave over you, each little slimy creature frantically slurping up a tiny piece of you, until nothing was left but shiny white bones disarticulating to tumble down to the bottom of the sea, where the bone worms would gnaw you into a thin calcium slurry.
Nah, probably not. But a guy can fantasize, can't he?