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Parodied: Bob spanked Cthulhu on the playground and make him cry, so Cthulhu parents take revenge on Bob by forcing him and his family to watch extremely boring video of their vacation in other dimension.
Zig Zagged: Bob defeats Cthulhu, and a worse entity take his place, but Bob also defeat it, creating a massive Evil Power Vacuum within the entity minions, giving Bob no other choice but to take the job of the entity and the command of his minions to avoid the apocalypse.
The author is sick of stories where the hero easily defeats an god or hideous demons and decide to write a story that shows that defeating a entity that can manipulate reality around itself is not as simply as it looks
The producers want a horror movie and forces the write to create either a sad or imperfect ending where the hero is against repercussions upon defeating the Big Bad.
Lampshaded: Bob, are you telling me that you didn't realize that killing a god could destroy the country and would infuriate it's parents if you succeed? Really?! Way to go, Bob.