You have a character. This character is flat out dumb. He is either a CloudCuckoolander, TheDitz, or even stupid to the level of Ralph Wiggum. Every bit of humor you get from this character comes from [[TheSimpsons the unpossibility of him failing English]] or being [[SpongebobSquarepants clueless about how to open a pickle jar]] among other things.

However, after a few years you hit a snag. You're starting to run low on jokes regarding his sheer stupidity. You've overused jokes about them forgetting to breathe and now you need something different. After all, variety is the spice of life. How do you change that?

The usual answer is to momentarily give this character the SmartBall. Completely out of the blue, your [[TheDitz ditz]] spouts out a tidbit of knowledge regarding astrophysics or thermodynamics. Some writers, however, take this act UpToEleven, by writing an ''entire episode'' regarding a character suddenly showing unnatural intelligence.

Obviously after five seasons of being TheDitz, you can't just have him become a master of string theory without someone wondering why [[AssPull he never showed it prior]]. Something has to cause this rapid change in intelligence level. A blow to the head, a scientific experiment, or alien technology shakes his brain up enough to unlock a level of intellect previous unheard of.

The result of this sudden intelligence often involves the character becoming [[TheAce an ace]], solving everyone's problems without batting an eye. He becomes an episode-long, equal-opportunity DeusExMachina, nothing becomes challenging for him to figure out. But this ace-hood can get to his head, turning him into an InsufferableGenius. This can lead to a case of AchillesInHisTent, the other heroes' life is at risk, but he won't help them (or they won't ask for their help) due to their strained relationship.

Often, a suddenly intelligent character will [[ScrewLearningIHavePhlebotinum know stuff they never actually learned]] without so much as an explanation.

[[FlowersForAlgernonSyndrome Usually the episode ends with something causing the character to revert to his old ditzy ways.]] Maybe this danger to the other heroes hit him in the head and locked that intelligence away. Maybe the other heroes purposely tricked him into doing something to lose it. Maybe he realizes what a jerk he became and willingly gives it up in the name of mending broken bridges with his friend. Either way, he's back to being the lovable idiot we're familiar with by the time the credits roll.
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!!Examples

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[[folder:LiveActionTV]]
* In an episode of Brazilian series ''SaiDeBaixo'', TheDitz accidentally becomes intelligent while trying to fix a broken electrical lamp. Despite the fact she was demanding everyone in her family to call her "Doutora (Doctor) Eugênia", they were actually liking her new self. Then, in another attempt to fix the lamp, she accidentally reverted back to normal. In the epilogue, her husband tried to repeat the process but made himself dumb.
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[[folder:WesternAnimation]]
* In an episode of ''JimmyNeutronBoyGenius'', the titular character performs an experiment on Sheen to make him a genius. It's successful, but soon it becomes GoneHorriblyRight, as Sheen's intelligence just keeps increasing. Eventually his brain becomes so powerful he masters telekinesis. Jimmy has to try to find a way to zap the intelligence back out of him before he takes over the world.
** Inverted in another episode where he makes himself stupid. He just wanted to make himself of average intelligence for the same reason stupid people who play with the trope want to get back to normal but the machine wasn't properly regulated.
* ''TheSimpsons'': After a crayon is dislodged from Homer's brain, he becomes a genius. But when he causes the entire town to turn against him after he causes the nuclear plant to be temporarily shut down. At the end of the episode, he gets Moe to stick a new crayon in his brain, reverting him back to being the old, stupid self.
* ''SpongebobSquarepants'': During a day of horseplaying, Patrick falls down a cliff and suddenly becomes a genius. He alienates his friends, and eventually enlists Spongebob in trying to make him stupid again. Turns out [[spoiler:the top of Patrick's head had come off and [=SpongeBob=] accidentally replaced it with brain coral.]]
* ''RegularShow'': Tired of being made fun of for not having a high school diploma, Rigby takes a smart drink that makes him a super genius. Mordecai drinks it too and engages in a EscalatingWar to see who is smarter. Eventually they get so smart that everyone else is too dumb for them to comprehend them, and they have to find a way of dumbing down to normal again.
* ''{{Chowder}}'' is given food to make him more intelligent after Mung Daal gets tired of him being such a scatter brain. It works a little too well, with Chowder even realizing he's a cartoon character in a dumb cartoon, then uses his brain to change the show into a more educational, albeit boring, one.
* ''PinkyAndTheBrain'': In "That Smarts", Brain made some calculations and concluded Pinky's lack of intelligence was the reason their plans to take over the world [[FailureIsTheOnlyOption never worked]]. Brain then decided to make him smart with a machine so complicated to use it must be operated by already intelligent people. The newly intelligent Pinky soon pointed out erros in plans Brain showed him afterwards and concluded their previous failures weren't his fault. He then pointed out Brain's miscalculations from when it was concluded it was Pinky's fault. Brain was so annoyed he told Pinky to leave. Afterwards, Brain made new calculations and found out the previous failures were ''his'' fault. He then concluded one half of the duo had to be idiot and then used the machine to make himself dumb. Oblivous to this, Pinky decided to use the machine to revert back to his stupid self. Brain now had no idea of what they do every night.
* One episode of ''WesternAnimation/DextersLaboratory'' has Dexter deciding to increase Dee Dee's intelligence and make her his new lab assistant. To do this, he replaces her literally peanut-sized brain with a much bigger one. The operation is a success, but Dee Dee is now actually ''smarter'' than Dexter is. She tries pointing out flaws in his machines, but Dexter's ego prevents him from heeding her warnings. Finally, Dexter's behavior offends Dee Dee so much that she decides that working for him is beneath her, and so leaves him with a cymbol banging toy monkey, feeling that it would be a more fitting assistant.
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