More Smarter

Synopsis
Rigby creates a new drink, which he dubs "Rig-Juice". Mordecai insults him, leading to an argument between them about who is smarter. Mordecai boasts that he has been the smartest since Rigby dropped out of high school. Angered, Rigby tries to get a high school diploma, only to be kicked out of school altogether. He tries to apply for a diploma online, but instead finds an advertisement for a drink that gives the user an intelligence boost. He uses it to denounce Mordecai as the smarter of the duo, but after discovering Rigby's secret, Mordecai drinks the brain boosting elixer as well. They try to disprove each other as the smartest by writing equations and formulas all over the house, and taking multiple drinks from the brain boost formula. Benson comes in and tries to stop them, only to be presented with the duo speaking Latin. Mordecai and Rigby, however, see Benson and the others as caveman-like creatures that speak only in grunts. Mordecai and Rigby discover that they are now too smart for the world around them, and only Rigby's "Rig-Juice" can dumb them down to their normal selves.

Plot
Rigby concuts a drink, believing it will make him successful, but Mordecai refuses to, insulting his concoction. Benson walks in and asks them if they can solve this math problem that involves building an enclosure for the park turtles. Rigby struggles at trying to formulate it, due to his lack of education. Benson then goes to find Skips, while Mordecai teases Rigby for not having a diploma.

Rigby, frustrated for not having a diploma, decides to go back to high school. After falling asleep and having a dream that he solved a problem which would have guaranteed his graduation, he wakes up in a classroom and the teacher abruptly tells him to leave. After Rigby gets back to work, he attempts to get a high school diploma online. There, he gets an ad for a drink that makes people smarter. He obtains the formula, disobeying the recommended amount, and drinks more than the prescribed amount, getting an intelligence boost, and brags about his new-fangled cranium to Mordecai.

Mordecai, jealous, drinks some of the smart juice and they begin drawing mathematical formulas all over the house (using 'tssk tssk' rather than 'hmph hmph') in an effort to prove who is the smartest of the duo. After drinking plenty more smart juice they begin floating. However when going back to their computer, everything they see has a mathematical formula and everyone starts to become barbaric.

Making matters worse, Benson tries to tell them to clean the math problems, only for him to hear the duo speak Latin. They drink Rigby's juice reversing the effect of the intelligence boost formula successfully, reverting back to normal with slight memory loss. Benson walks in and tells them to clean the grafftti on the walls. After Mordecai and Benson walk away to clean the grafftti, Rigby drinks some more of the 'RigJuice'.