Fanboy loses his brain after forgetting to take a parachute with him while performing a stunt, Chum Chum tries to teach Fanboy how to be himself again, and Yo tries to take advantage of the situation by trying to kidnap Chum Chum while Fanboy's mental facilities are impaired.
Tropes:
- Bottle Episode: Only three major characters and it's all set at the Fanlair.
- Brick Joke: Several throughout the episode:
- Fanboy says that "as long as [he has] a brain in [his] head," he won't let Yo have Chum Chum. Guess what she tries to do once Fanboy loses his brain.
- One of the props in the stunt sequence the boys perform at the start of the episode is a damp sponge. It serves as Fanboy's replacement brain for a while, after Chum Chum concludes that he could just teach Fanboy how to be himself again and the sponge would soak up all the information.
- When Chum Chum is teaching Fanboy how to be himself, he tries to teach him how to make a sandwich, then, when seeing Fanboy putting a toaster in his mouth, he tries to teach him that only food should go in his mouth. Fanboy's response? Open the top of his head and throw an entire loaf of bread in there. Later, Fanboy's making a sandwich and accidentally puts his brain in there, much to Chum Chum's horror, but he stops short when he remembers: "Food goes in mouth!" and throws his brain into his head, which brings him back to normal.
- Die, Chair, Die!: Fanboy to his alarm clock, shortly before smashing it with a mallet: "'Oh, look at me! I can tell time!' BIG WHOOP!"
- Inherently Funny Words: NARWHAAAAL!
- Insistent Terminology: Yo says she didn't take Fanboy's brain, but found it under the boys' loveseat. Chum Chum isn't having any of it.
- Here We Go Again!: In the end after Fanboy is restored, he and Chum Chum share a hug, but FB squeezes CC so hard that he loses his brain and begins suffering the same brainless situation as him.
- Oh, Crap!: Yo has this reaction when Chum Chum sees her backpack leaking, leaving him to realize she took Fanboy's brain.
- "Psycho" Strings: When Yo is close to having Chum Chum to herself and giggles after he goes off to check on Fanboy, these play in the background.
- Simpleton Voice: Fanboy after he loses his brain, but he sometimes lapses back to his normal voice when he has moments of lucidity.
- Slasher Smile: Yo gets one when she finds Fanboy's brain and decides to hide it in her backpack to get closer to Chum Chum.
- Took a Level in Dumbass: Well, given that Fanboy lost his brain and didn't die, this is probably the only thing one could reasonably expect to happen to him.
- Who Even Needs a Brain?: Fanboy can survive without his brain; he just acts even more ditzy than usual and has no memories of his old self. A sponge placed in his head even seems to be a semi-suitable replacement.
