jawbreaker

Ann knew the end was near. Kong gave no quarter, and as his tiring adversary attempted to rise, he scrambled onto its back. From behind, he grabbed its head, and twisting its skull with both arms, he forced it to roll agonizingly back down to the ground. Kong quickly maneuvered atop the writhing beast and again wrenched its neck. While leveraging his weight atop the gasping creature, Kong managed to free one arm. Again and again, he smashed his fist against the head of his foe. He shattered enough of its teeth to gain a grip with both hands between the gaping jaws. The monster writhed and hissed as Kong pulled with all his might in an attempt to rip the jaws apart. The dying predator made a last futile attempt to shake Kong loose with a twist of its neck, but it was no use.
Kong’s shoulders knotted in effort. Ann screamed as she saw the dinosaur’s jaws finally yield. With a sickening crack, the joints gave way. Kong grabbed the upper jaw, twisted it, and pushed down with all of his might, breaking the beast’s neck.
At last it lay twitching in its death throes: reflexive jerks, then random shudders, slower, slower. Kong stepped back and grunted. He then advanced and quizzically manipulated the limp lower jaw before dropping the head to the ground. The form lay still. Kong prodded it. No movement. With a growl, he pounded with both fists on the prostrate dinosaur. Nothing.

Merian C. Cooper's King Kong, Chapter 15