Irrational Treasure

"Irrational Treasure" is the eighth episode in Season 1 of Gravity Falls. It debuted on August 17, 2012.

Overview
When Dipper and Mabel discover evidence that the reported town founder is a hoax, they set out to expose the historical cover-up and prove that Mabel's silliness is not a bad thing.

Synopsis
When Gravity Falls' holiday, Pioneer Day, comes around, Grunkle Stan, Dipper, and Mabel stroll through town, looking at all the out-dated activities and ceremonies. Later, Sheriff Blubbs calls the town to a meeting where Pacifica Northwest makes an announcement about her great grandfather, Nathaniel Northwest. Pacifica asks for volunteers to say something about themselves. Mabel comes up and Pacifica makes Mabel feel bad by telling her she's silly, and Mabel decides she should be more serious by taking off her nacho earrings and her sweater. Dipper then finds an article in his 3 book that says Nathaniel Northwest was a fraud. Enclosed was a map, with the triangle symbol. Behind a statue, Sheriff Blubbs and Deputy Durland hear Dipper and Mabel's plan. He tells an anonymous man with several cameras. Dipper and Mabel head to the library to look up the symbols on the map. Dipper Finds a symbol that means fire. Dipper thinks they should burn the document, until Mabel makes a hat out of the paper, which shows them a map to Gravity Fall's Museum of History. Dipper dramatically says they're going to have to break in! Dipper and Mabel head to the Museum where a lady says here's your Pioneer Day free passes and your pink and blue balloons. Dipper then dramatically says, "We're in!" There's an abstract painting shaped in a triangle, and when Mabel turns upside down, it reveals an pointing angel, and she comments that she saw that statue in the cemetery. Once at the cemetery, Mabel sees the statue, and she pretends that the statue is picking her nose. She bends the statue's finger, opening a secret passageway. Mabel and Dipper enter it, and Dipper says to watch put for booby traps. Mabel then laughs at booby traps. They go down the hallway when Mabel steps on a button, which triggers tranquilizer darts. They dodge the darts and go down a hallway revealing many top secret documents. They come across a document called The Northwest cover-up, and the true founder of Gravity Falls was Quentin Trembley. Sheriff Blubbs and Deputy Durland discover them and play a film showing the truth about Gravity Falls. Sheriff Blubbs then says he must ship them off to Washington DC with Quentin Trembley's peanut brittle capsule. The gang is now in a giant crate. Mabel, in fury eats part of the peanut brittle, freeing Trembley. They escape and are caught by Blubbs and Durland. They escape to the roof when Trembley recalls that he never signed a resignation, and that he ate a salamander and jumped out the window instead. Trembley then orders the cops to stop, and take a vacation. When Dipper Mabel and Trembley head back to town, Trembley decides to make Mabel a Congressman and gives her a hat. Dipper gets the President Key which can open any lock in America. Back in town, Mabel accepts her silliness and Dipper shoves the proof in Pacifica's face, calling her family a 'sham'.

Credits

 * Story by:
 * David Slack
 * Written by:
 * Tim McKeon
 * Alex Hirsch
 * Directed by:
 * John Aoshima
 * Storyboards by:
 * Mark Garcia
 * Chris Sonnenburg
 * Niki Yang


 * Starring:
 * Kristen Schaal - Mabel Pines
 * Jason Ritter - Dipper Pines
 * Alex Hirsch - Grunkle Stan/Quentin Trembley/Old Man McGucket
 * Jackie Buscarino - Pacifica Northwest
 * Keith Ferguson - Deputy Durland
 * Kevin Michael Richardson - Sheriff Blubs
 * Gregg Turkington - Toby Determined
 * Thurop Van Orman - Lil' Gideon


 * Additional Voices:
 * Keith Ferguson
 * Alex Hirsch
 * Chris Parnell
 * Kevin Michael Richardson
 * Jason Ritter
 * Tara Strong
 * Gregg Turkington
 * Kari Wahlgren

Production notes
See also: List of allusions and List of goofs.

Character revelations

 * We see Mabel not wearing a sweater during the day for the first time.
 * Dipper ends up accepting Soos' nickname for Dipper and Mabel, "Mystery Twins", from "Headhunters".
 * Mabel learns to accept her silliness.

Trivia

 * This is the first time the Mystery Shack is not shown, though it is mentioned.
 * Gideon makes a cameo dressed as a tomato farmer.
 * There is a new unknown whisper in the beginning theme.

Cryptogram

 * During the end credits of this episode, there is a cryptogram that reads "V. KOFIRYFH GNNYOVB" Once decoded, it reads "E. PLURIBUS TREMBLEY"