- Creepy Awesome:
- In-universe and perhaps out of it, Jeff in high school, surprisingly (though Derf insists that he lost, and should lose, all sympathy once he actually murdered someone). He becomes an eccentric cult figure to Derf and his friends after he begins pulling fake fits of cerebral palsy to prank the teachers (especially the librarian). Derf's friends begin a fan club for Jeff, and organize a final "Command Performance" where he wanders around freaking out customers at the local mall. Derf also includes Jeff as a character in all of his high school sketches, including one published in Revere High School's 1978 yearbook.
- During a field trip with classmates to Washington DC, Jeff uses a payphone and talks an aide into letting him and Neil visit the Vice President of the United States.
- Face of an Angel, Mind of a Demon: Not commented on in-movie or comics but some folks in Real Life have commented on teenage Dahmer's appearance...Compounded by seeing◊ Ross Lynch playing the guy◊note .
- Funny Moments: The depiction◊ of the agitated Librarian◊ with her short, fast little walk basically depicted as a mincing, mini-Wheel o' Feet like Velma in A Pup Named Scooby-Doo.
- Harsher in Hindsight:
- The very end of the book. In 1988, Derf meets up with two high school pals and they reminisce about other classmates. Jeffrey (just beginning his spree at this point in time) is brought up. Derf jokes that Jeff is "probably a serial killer by now.""And we all laughed."
- The sketches Derf drew of Jeff as the "Minister of Propaganda" for the Dahmer Fan Club. He put Jeff in his drawings for student election flyers and Revere High's yearbook (where the other characters are all speaking in "Dahmerisms.")
- The very idea of the Dahmer Fan Club in the first place.
- The very end of the book. In 1988, Derf meets up with two high school pals and they reminisce about other classmates. Jeffrey (just beginning his spree at this point in time) is brought up. Derf jokes that Jeff is "probably a serial killer by now."
- He Really Can Act: Ross Lynch as the titular Jeffrey Dahmer from the 2017 film.
- Jerkass Woobie: Derf notes that Jeff was not completely sympathetic. Case in point is Jeff's hysterical amusement when a classmate slips in a puddle and injures his shoulder.
- Misaimed Fandom: Addressed by Derf in the foreword. He wants nothing to do with Loony Fans who idolize and are romantically attracted to serial killers, which regrettably exist, so if they're reading the book because of that, he'd prefer they not note .
- Moral Event Horizon: The murder of Steven Hicks. It's at this point where Derf considers Jeff beyond redemption.
- Nightmare Fuel:
- The mutilated dog. Even though Derf draws the carcass in the same cartoony style as the rest of the book, his drawing of the dog's skull on the stake is just as unsettling as pictures of the real thing◊.
- Jeff's fantasies of the neighborhood jogger lying dead on his bed. Arguably worse is Jeff's attempt to act on that fantasy.
- Viewer Gender Confusion: Lloyd Figg in the movie (but not in the comic).
YMMV / My Friend Dahmer