Round the Twist/YMMV

Nausea Fuel: The brains in "Brainless", need we say more.
Nightmare Fuel - The series is quite renowned for having not just the weird, but the downright creepy.
- The first episode features a ghost that likes to peek on those going about their business in the outdoor toilet.
- Pete and Linda are chased by hordes of seagulls that eventually trap them in a hut and seal them inside by defecating on it.
- In the "Spaghetti Pig Out" episode, the children discover a remote that can affect things in real life. The Nightmare Fuel comes in at the end when after one of the bullies vomits a truckload of spaghetti onto the crowd, Pete points the remote and presses the rewind button. We are left with the bully begging for mercy and screaming.
- The "Know it All" episode involves a scarecrow that slowly comes to life after clown clothes are placed on it. Enough said, really.
- Linda falls in love with a mysterious transfer student who begins to grow fingernails all over his body. He turns into a merman, as mentioned below.
- The episode "Yuckles" tells the story of incredibly rare mushrooms that are able to take on the form of any object, including people, and then explode. Linda gets copied at one point. When bullies confront the clone, she explodes into revolting yellow goo.
- There is an episode entirely dedicated to Nightmare Fuel called "Quivering Heap". Pete is locked in a public bathroom for the night where a ghost is trying to pass his Scare Test. Such highlights include: a rotting skeleton with cockroaches falling from its mouth; and a GIANT spider crawling out of a toilet.
- Adnil Linda's clone dying in Linda's arms in the episode The Copy.
Crazy Awesome - Bronson 'saving his smell' until he can use it as a weapon in "Smelly Feat". Seriously.
Ear Worm - Good luck getting that theme tune out of your head.
Tear Jerker: Adnil disappearing from her original's arms.