* Mickey Mallone's condition and the barbed-wire curse. [[MadnessMantra "Hurts, it hurts, it hurts, it hurts, it hurts..."]] along with high pitched giggling.
** ''Everything'' about the Nightmare was scary!
--> Murphy just sat there, staring ahead. Another low breath rattled out, not quite making a sound-but I recognized the effort she was making for what it was.
-->Murphy was screaming.
* The end of ''Grave Peril'' [[spoiler:where the Red Court vampires, led by Bianca, attack him in what could only be described as a gang rape scenario.]] Harry is so traumatized that whenever he brings it up it later books, he still talks about having [[BadDreams nightmares]], even in ''Changes''. He never goes into detail, instead saying only "They did things to me," which is extremely disturbing coming from Harry "Badass" Dresden.
* Harry's magical evil doppelganger made for some in-universe NightmareFuel for Murphy in later books.
* Agatha Hagglethorn's attack on the nursery, and how all those helpless babies ... hushed. Talk about AdultFear!