A signature trope of the series, here's Insane Troll Logic in The Amazing World of Gumball.
- In "The Picnic" Gumball reasons that, because everything (including food) is made up "circles with circles around them" (atoms), a rock is the same as a chicken nugget.
- In "The Meddler", Gumball reasons that by joining the cheerleading squad, he'll impress Penny with his masculinity and outperform her in the competition to make her love him.
- Every time Donut Sheriff walks into a crime scene, he looks at something disturbing, something else that looks dangerous, and at the only person conscious, concluding that they're the culprit and treating them with unreasonable hostility despite having no knowledge of anything or evidence.
- In "The Spoon", he looks at a knocked-out Darwin and Gumball, then Nicole, then a sausage and assumes she hurt them.
- In "The Sock", he looks at Gumball and Darwin, then the filing cabinet, then a phone, and assumes they're responsible.
- In "The Spoon", Richard has to get a gift for Nicole's birthday, but can't because he has to watch the kids. So he decides to send his two sons Gumball and Darwin to get it since, as kids, they don't have to watch the kids. Anais responds by facepalming.
- In "The Car", Mr. Robinson goes berserk over his new car that got destroyed accidentally by the Wattersons as a whole up to the point where he calls the police to arrest Gumball and Darwin for destroying his car. When Donut Sheriff refuses to do so without a warrant, Mr. Robinson states that he pays his taxes, which pays Donut Sheriff's salary, thus making Mr. Robinson Donut Sheriff's boss.
- In "The Bet" when Principal Brown takes Gumball and Darwin to his office for using Bobert to mess with the school nurse, Gumball argues that what Principal Brown is doing is a violation of the First Amendment, to which Brown lets Gumball know that he's completely wrong.
- In "The Finale", the Watersons are sued and thrown in jail for the trail of carnage they left behind during all the season's antics. They try to invoke Status Quo Is God by maliciously leveling the entire town "So everyone forgets like they normally do". It doesn't work and the episode ends with the enraged citizens moving in to kill them. Though since this wasn't the end of the series, it apparently worked somehow.
- "The Romantic" had a scene where Gumball arranged for Penny to go to a dessert place at the mall only after accidentally directing her to the middle of the desert. There, Larry gives her a sundae with peanut and blueberry ice cream, as Gumball had forgotten about her previously-established Plot Allergy to blueberries. He detailed in a note that once he remembered, instead of telling Larry to just hold the blueberry, he would put an allergy pill in the cherry on top to balance it out.
- "The Petals" has a great example when Gumball and Darwin try and find Leslie.Gumball: Hmmm... Petals. It's a clue!
Darwin: What do you mean?
Gumball: Think about it. What is petals? Flowers. What is made of flour? Bread. Who eats bread? Everyone. Apart from people who can't eat gluten. Who doesn't eat gluten? People on a made-up diet! What kind of people are usually on fad diets? Drama queens. Who are usually drama queens? Actors. And what do actors do in real life? They work as waiters in the food industry. And where do they lie about not working in the food industry? In their dressing rooms! [Darwin and Gumball open a nearby dressing room to find Leslie inside]
Darwin: Huh. You were right!
Gumball: You said that like it's a surprise. - In "The Father", when Richard and his kids are looking at the clouds (attempting to cheer up Richard after his dad leaves), one reminds the former of a Popsicle. This reminds him of his dad because...Richard: Popsicles are cold like the Arctic Ocean. And that's cold because it's got lots of icebergs in it. That's why it's dangerous for ships. Because icebergs sink ships. And what's the first thing to leave a sinking ship? A rat... [tears up]
- In "The Factory", Gumball tries to justify exploring Nicole's place of work against her instructions on the grounds of returning important papers she dropped. Darwin is skeptical, but Gumball manages to win him over.Gumball: Darwin, all it takes for bad things to happen is for good people to do nothing.
Darwin: I don't think we count as good people.
Gumball: Then all it takes for good things to happen is for bad people to do something! - In "The Mothers", when Gumball and Darwin go onto scaffolding that is meant for only one person, they reason that jumping up and down on the scaffolding would halve their weights, thus obeying the requirement. Naturally, their constant jumping merely causes the scaffolding to break, and for their lives to be put in danger when they are left hanging on the banner they painted on.
