* CrowningMomentOfFunny: The chapter of Mona's "coven" meeting. But the crowner has to be when Oyster pushes Carl too far, and Carl snaps... [[spoiler:and [[{{GallowsHumor}} Plucky the parrot drops dead]].]] Helen's reaction of "I didn't do it" cinches it.
* MoralEventHorizon: [[spoiler:Oyster's [[GrandTheftMe Grand Theft of Helen]] to destroy her and cruelly mock Carl.]]
* NauseaFuel: In Carl's [[spoiler: confrontation with Nash, Nash]] killed every single person inside a resturant. Including [[spoiler: a chef who fell facefirst onto the stove.]]
** Also, Mona extracting things from Carl's feet.
** Also the nudist exiting the toilet with paper stuck up his ass.
* ParanoiaFuel: There are certain people who can kill you by simply reciting a few words to you. There are even a few people who can kill you by '''thinking''' the song at you.
** And you can accidentally kill your family by singing them the wrong lullaby.
** [[spoiler:[[GrandTheftMe Oyster could be anybody.]] In an in-universe PoisonOakEpilepticTrees, Carl thinks he could be impersonating the supposedly not-so-dead Helen.]]
* TearJerker: The end, in which Carl [[spoiler: sings the culling song to the dying Helen. She gets better... sort of.]]
** [[spoiler: The revelation that the couple Carl and the gang saw gardening were Carl's parents, and Carl's call to his dad afterwards.]] [[FromBadToWorse It becomes even sadder]] [[{{RealitySubtext}} when you remember that the author wrote this book in response to the death of his father]].
** Both of Helen and Carl's encounters with parents [[spoiler: who accidently killed their children with the culling poem.]]