We present a list of Simpsons
underground jokes - instances where we the viewer is
treated to a cross-section of the floorboards between the Simpson home. We also list all
the underground jokes too!
Lead piping and asbestos insulation can be seen between the living room and Lisa's bedroom, as well as a dead mouse.
A snake is between the floors of Springfield Elementary (between 4th and 2nd grade classrooms).
As the camera pans up to Otto reading Lisa a ghost story, gold and jewels fill the floor space between the living room and Lisa's bedroom.
After Maggie is put to bed, we see a reel-to-reel tape recorder and microphone is recording, underneath her room.
On the Season 7 DVD, there is a short deleted scene where the camera pans up from Bart & Lisa in the basement to Homer & Marge in their bedroom. There are termites in the floorboards between each of the floors.
After Marge yells at Homer, she is in bed while Homer paces downstairs. The floor is full of secret service wires, labelled: NSA, FBI, ATF, CIA, KGB and MGI.
Bart & Lisa watch Itchy & Scratchy early on Sunday morning, and their laughing wakes Marge up. Snowball II appears to be trapped between the living room and the main bedroom.
Newly-hatched lizards are between Homer and Marge's bedroom and the living room. In this instance, the camera stops for a few seconds to show a third egg hatching.