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Monster trying to get its teeth into you? Here's an unusual solution; force the creature's jaws apart until they break.
Oddly, this is almost always portrayed as causing instantaneous death (in which case it's usually taken to be a "cooler" version of a Neck Snap), when it should leave them alive but in crotch-stompingly horrible pain.
For some reason, reptilian monsters are especially prone to this.
A nastier variant is to simply tear the jaw off altogether.
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In 52, after Sobek's true colors are revealed, Black Adam finishes him off this way.
Pictured to the right: in an issue of The Walking Dead, upon being tackled by a zombie, Cesar Martinez sticks his hand in its mouth and breaks its jaw before it can bite his fingers. Okay he had gloves on, but still.
In Secret Six, Jeanette breaks King Shark's jaw this way. Somewhat subverted, as this doesn't kill him, but it obviously leaves him in excruciating pain.
Thragg does this to Dinosaurus in an issue of Invincible, but he lives.
Yoko in The Grudge suffers this, as does Kanna in Ju-on. The third The Grudge film shows that Gretchen also suffers this fate.
The "reverse beartrap" in Saw, one of the series' mainstay traps. Unusually for Saw, everyone put in it manages to escape until the sixth movie, and even then Hoffman manages to jam it and escape with half a Glasgow Grin. In the next (and final) movie, he gets his revenge using the original model. Game over.
The Leprechaun rips a woman's upper jaw out (to get the tooth she made out of his gold) in Leprechaun: Back 2 tha Hood.
The now zombified main character in Sella Turcica kills his brother by ripping his lower jaw out. Quite nasty◊.
And Titus does it with so much force that it makes the Nob'z head explode.
In God of War, Kratos finishes Cerberus this way, in order to steal the artifact held within its mouth.
In Halo, the aliens known as Elites have 4 mandibles in place of a bottom jaw. A new character named Rtas Vadum in Halo 2 was missing his right mandibles, leading to the nickname "Half-Jaw" before his real name was revealed. In the expanded universe comic that named him, it's revealed the mandibles were cut off in a Laser Blade duel with a Flood-infected subordinate soldier. He refused to have a cybernetic replacement, as the injury reminded him how strong the Flood truly were.
The Adventures of Dr. McNinja: Doc does it to a zombie. Since it was undead, it doesn't really kill the thing, but it does prevent it from biting him.
He doesn't stop with just removing the jaw, though. He proceeds to punch through it's spinal column, which is the part that kills it.
Part 4 of The Sacrifice has one of Bill's surgeons turn just as he's getting anesthetics. The ensuing struggle between her and the doctor has him tear her jaw off before she kills him and moves on to Bill.