Jaws- Getting Porpoise

The rope attached to the porpoise tautened and shivered. The knot by which it was secured to the cleat tightened so hard that the rope flattened and its fibers popped. The wood under the cleat began to crack. Then the rope snapped backward, went slack, and curled in the water beside the boat.
"I'll be fucked!" said Quint.
"It was like he knew what you were trying to do," said Brody, "like he knew there was a trap set for him."
"Goddammit! I never have seen a fish do that before."
"He knew if he knocked you down he could get to the porpoise."
...
Quint walked over to the starboard gunwale and began to pull in the rope. "He either bit right through the chain, or else... uh-huh, that's what I figured." He leaned over the gunwale and grabbed the chain. He pulled it aboard. It was intact, the clip still attached to the eye of the hook. But the hook itself had been destroyed. The steel shaft no longer curled. It was nearly straight, marked by two small bumps where once it had been tempered into a curve.
"Jesus Christ!" said Brody. "He did that with his mouth?"
"Bent it out nice as you please," said Quint. "Probably didn't slow him down for more than a second or two."

-Jaws, Chapter 13