I would say it foreshadows that this book is going to be horrible, but the title did a sufficent job of that
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Piggy
to kill the pig
He says in comes out of the ocean at night. :P
It refers to childhood or playfulness during a time of "serious" or adult situations being discussed while on the log.
He makes a stand against Jack and the choir boys because they had not acted upon their responsibility of keeping the fire going.