Stephen King's The Dark Tower: Roland Deschain and the Lobstrosities.

The Dark Tower II. The Drawing of the Three.
Prologue.

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Freezing cold water doused his boots and ran up his leg to his crotch. His eyes flew open then, and what snapped him out of the dream wasn't his freezing balls, which had suddenly shrunk to what felt like the size of walnuts, nor even the horror to his right, but the thought of his guns... his guns, and even more important, his shells. Wet guns could be quickly disassembled, wiped dry, oiled, wiped dry again, oiled again, and reassembled; wet shells, like wet matches, might or might not be usable again.

The horror was a crawling thing which must have been cast up by a previous wave. It dragged a wet, gleaming body laboriously along the sand. It was about four feet long and about four yards to the right. It regarded Roland with bleak eyes on stalks. Its long serrated beak dropped open and it began to make a noise that was weirdly like human speech: plaintive, even desperate questions in an alien tongue. "Did-a-chick? Dum-a-chum? Dad-a-cham? Ded-a-check?"

The gunslinger had seen lobsters. This wasn't one, although lobsters were the only things he had ever seen which this creature even vaguely resembled. It didn't seem afraid of him at all. The gunslinger didn't know if it was dangerous or not. He didn't care about his own mental confusion—his temporary inability to remember where he was or how he had gotten there, if he had actually caught the man in black or if all that had only been a dream. He only knew he had to get away from the water before it could drown his shells.

He heard the grinding, swelling roar of water and looked from the creature (it had stopped and was holding up the claws with which it had been pulling itself along, looking absurdly like a boxer assuming his opening stance, which, Cort had taught them, was called The Honor Stance) to the incoming breaker with its curdle of foam.