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These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Grim Adventures of Billy & Mandy
Anvilicious: In "My Fair Mandy", Grim questions why anyone would participate in beauty pageants (Mandy is only doing it to show up Mindy). Cue several moms encouraging their daughters to win for the sake of their love.
Base Breaker: Fred Fredburger became this after being extremely overused in CN's promos along with the excessive overuse of his nachos and poopoo jokes.
As was Mandy, after she became a Jerk Sue in later seasons.
Billy, between fans who find him hilarious and fans who find him annoying and one-note.
Crosses the Line Twice: The Christmas special. Features such things as a mall being burned to the ground as the Mall Santa is mercilessly beaten (with The Grim Reaper implying that this happens all the time and Billy blaming it on the sad state of the economy), evil vampire Santa, Santa's evil vampire wife, and the school bully being eaten by a pack of flying vampire elves. An average Christmas Episode of a show is packed with heartwarming moments and the old theme about "family and friends being the true meaning of the holiday season," but this show proves that you can have none of that and still be entertaining. Combine that with the fact that this is a children's show (by Cartoon Network's more-or-less loose standards) and you get a truly dark (and hilarious) episode.
A lot of the humor can dip into this, it being Black Comedy.
An in-series example: in the beginning of Billy & Mandy's Jacked-Up Halloween, Irwin's first Halloween costume is Sleeping Beauty, as a lame attempt to get Mandy to kiss him. Fast forward to Big Boogey Adventure, and it's Mandy who's now the sleeping beauty that needs to be awakened with a kiss. And guess who kisses her?
Billy, though a good kid, has tried to kill his "adopted" son just because he's afraid of spiders.
Irwin has allowed a Pyramid to be built in his honor, regardless of whether or not everybody remains brainwashed.
Nergal forces a number of people into transforming into his "Friends" in the second episode he appears in.
Boogey crossed it in Wrath of the Spider Queen. During the contest for who would become the future Grim Reaper, Velma was close to winning, but Boogey decided to rig the voting. When Velma finds out, she thinks Grim tried to cheat, costing him his only friend.
Ms. Butterbean crosses it in Substitute Creature when she ignored Sperg bullying Junior because he bribed her with an apple. To really twist the knife, she tells Junior that it's okay for Sperg to do it because he was bigger.
Or when the closing iris closes on Billy's head and a bunch of blood and snot sprays from his nose and his eye pops out.
Or when Billy and Mandy force Grim to resurrect the school mascot cats. That, in itself, is pretty bad, but when Billy asks one of the cats to scratch his back...his skin and muscle get shredded by the splintered claws of the undead cat, and his spinal column pokes out.
In the episode, "Zip Your Fly," Mandy accidentally swapped her head with that of a fly after messing with Grim's zipper. That's pretty standard for the show, but then after losing the zipper to the dump, she ends up eating the entire landfill before she can find it and get her body back.
The Scrappy: Billy is this to more than a few viewers, due to how arguably flat he is as a character and for being a often pointless Toilet Humor dispenser. He's even this in universe.
Fred Fredburger is also this in universe, even managing to annoyBillywith his stupidity. Among viewers, though, he's a Base Breaker, with many who love him and many who feel he ended up over-used. (Although he wasn't half as over-used as characters like Cheese and Goo.)
What Do You Mean, It's for Kids?: Like nearly all of Cartoon Network's in-house programming (specifically those from the "Cartoon-Cartoon" era of shows), this show is a kids' cartoon on the outside, and on the inside, is packed with a lot of things that most normal channels wouldn't allow to touch children's animated shows. In the case of this show, it's Black Comedy, some mild sex and toilet humor, and disturbing imagery that makes Invader Zim look like My Little Pony.