A class of schoolboys get marooned on an island (can't remember how; plane crash?). They initially try to have a civilized society, but everything devolves terribly. They resort to factions and degrees of savagery (violence) by the end of the book when they ultimately get rescued. I think the people who find them are shocked by what they've become.

The lord of the flies is a rotting pig's head that one of the boys interprets as such due to a medical condition (epilepsy, maybe?) There's a ton more to be said about it, but I haven't read it in many years. The gist of the joke is that by locking the students in, they will be made to experience devolution first-hand over time.

And hey, because the word came up, new-wave / post-punk band Devo are playing their farewell tour. Tickets were higher than I can justify (I've never been a fan per se and would be going just to see a cultural icon), but if you're into them, go Devolve and have a fun time.

Oh, ETA: they initially formed their society by one boy blowing into a conch shell to draw others together. I missed the conch in the final frame.