My Gym Partner's a Monkey - Season 1 - Eps 10: Shiny Thing
When Jake finds a diamond doorknob, he discovers its power when all of his classmates (except Adam) become enchanted with the item due to its shining, causing Jake's obsession of his butt to go to far, making all of the students study only monkey butts.
About My Gym Partner's a Monkey

Title: My Gym Partner's a Monkey
First Air Date: 2005-12-26
Last Air Date: 2008-11-27
Status: Ended
Rating: 6.183/10 (from 93 votes)
Language: EN
Seasons: 5
Total Episodes: 100
Network: Cartoon Network
Genres: Animation, Comedy, Kids
Production Companies: Cartoon Network Studios
Synopsis
My Gym Partner's a Monkey is an American animated television series created by Tim Cahill and Julie McNally-Cahill and produced by Cartoon Network Studios. The story revolves around Adam Lyon, a human who, after a clerical error listed his surname as "Lion," is forced to transfer to Charles Darwin Middle School, a school for local anthropomorphic zoo animals, where he is partnered with Jake Spidermonkey in gym, with whom he quickly becomes best friends.
Cast

Tom Kenny
Jacob P. 'Jake' Spidermonkey / Henry Armadillo (voice)

Grey DeLisle
Ingrid Giraffe / Guadalupe 'Lupe' Toucan / Mrs. Geraldine Sharon Warthog (voice)

Rick Gomez
Windsor Gorilla / Slips Python (voice)

Phil LaMarr
Virgil 'Bull' Sharkowski (voice)

Nika Futterman
Adam Lyon / Miss Chameleon (voice)

Cree Summer
Kerry (voice)

Brian Doyle-Murray
Coach Tiffany Gills (voice)

Maurice LaMarche
Principal Poncherello Pegone Pixiefrog (voice)