Mr. Harryhausen seemed to enjoy portraying his recently dead creations with their mouth hanging open. Not all the time, but quite a bit. The Ymir is a good example.
So, to sum it up in legal terminology: Get lost, you bum.
Thats how it works quite a bit of the time.
Ray must have seen his share of dead animals.
People die with their mouths open as well.
Everything just kinda goes limp, jaws drop.
You have to obey gravity, ITS THE LAW ;)
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"Pffft, my suspension of disbelief has higher standards than that"