The bathtub scene, while hilarious, definitely qualifies as this. It comes out of nowhere, is one of the few scenes without Wayne, and has almost no bearing on the major characters.
Until Voldemort introduces Xavia Jones, his introduction scene counts as this.
Crazy Is Cool: This fits Leanne to a tee. She's seen throughout the show as a little insane and still obsessed with the fact that she's a wizard, but then in seventh year, she gives an awesome pep talk and manages to take down multiple Death Buddies before dying.
Esoteric Happy Ending: Wayne Hopkins is dead and hardly remembered by anyone, and it's implied that he isn't alone, although Megan and Oliver go out of their way to make sure his story is told through their son.
Fan Wank: The only inconsistency between the original series and Puffs is that Zach Smith fights in the Battle of Hogwarts, so some fans have theorized that he's a time traveller - something hinted to in many of his improvised monologues.
Ascended Fanon now that, as of Nineteen-ish Years After, Zach Smith is a time traveller.
Glurge: Although a monologue from the narrator implies that the Puffs are inspirational, it's hard to ignore that the Puff we've followed the entire show dies tragically and is left almost entirely unremembered. Although Tropes Are Tools; it does give a message that you don't have to be the Chosen One to live a meaningful life.
Informed Wrongness: The show falls into this with giving Wayne the same angsty grieving methods as Harry after Cedric's death. Like the books/movies, it's a thin line between whether he's right or wrong in his feelings, although the narrator seems to think that it's definitely wrong and skips through Year 5 as quickly as he can.
Iron Woobie: Megan, without a doubt. She's been abandoned by her mother, a Death Buddy, and has an incredibly hard time making friends...yet she's one of the most capable wizards we see in the show, as well as a great friend to Oliver and Wayne.
Nightmare Retardant: Many of the scenes that make light of scarier moments from the books or movies count as this. Try rewatching the first task in Goblet of Fire without thinking of the first task scene from the play.
Realism-Induced Horror: Dying due to an instant Killing Curse - or Green-Light Curse - isn't really a fear of anyone in the real world. Dying before your time, just as the world seems to be looking up, with no guarantees that you'll even be remembered? That's definitely more scary.
Shocking Moments: There are two major deaths in the show. Cedric's is expected. Wayne's is not.
Too Cool to Live: Cedric Diggory is an awesome mentor, insanely charismatic, and a good friend to Wayne. So naturally, he's the first to die.
Leanne falls into this as well, although she does take down multiple Death Buddies with her.
Vanilla Protagonist: Done on purpose with Wayne, who's pretty ordinary, even for the Puffs, but has big dreams of changing the wizarding world as we know it. His drive to keep trying and learn as much magic as he can wins the crowd over... which just makes it even more devastating when he's killed in battle, right as he's finally becoming a skilled wizard.
Visual Effects of Awesome: While the show averts this in multiple moments, like the hand puppets depicting the Hogwarts founders and the dragon from the first Triwizard task, its awesome moment comes with the Dementors' appearance in Year 3 - which even rattles the narrator.
What Do You Mean, It's Not for Kids?: The show seems like a fun look into a different point of view of the Harry Potter series, right? Nope. There are many sexual jokes and lots of cursing. And even at matinees, where the show is toned down for family viewing, there's still the death of themain character in the Battle of Hogwarts and his realization that he has no control over whether he'll be remembered by his friends.
The Woobie: It's a wonder this show manages to be so funny when the entire trio of main characters falls into this.
Oliver is a kid at the top of his class who has to start over at his new school, where he's placed in everything from Remedial Potions to Remedial History of Magic. Not only that, he's a "Mug-born" and has to deal with persecution in the wizarding world, which gets so bad that he leaves the school during seventh year.
Megan has to deal with the fact that her mother is one of the top Death Buddies and is in WizPriz (Azkaban in the original series). Due to her lack of social skills and obsession with becoming just as much of a badass as her mother, she has a very hard time making lasting friendships.
And Wayne is painfully bad at magic. He can barely perform a simple Summoning Charm. He decides to get help from Cedric Diggory...who then dies. His two best friends are an outcast who hates the Puffs and a "Mug-born" who leaves the school due to prejudice in the wizarding world. And when he finally gets good at magic, he's killed in battle and is destined to become "an unnamed dead kid in a school battle - Potter's battle."
