Big Boo's Car

Big Boo's Car is a level found in Big Boo's Restaurant' s carpark. It is described as an enlarged version of a car interior approximately the size of the Secret Aquarium level. Strangely, the level appears devoid of stars, though contains a rumored collectible similar to the Ghoul Medal known as "Big Boo's Car Keys".

Geography
The level's a car, I don't know what you expected it would be. There's strangely a thick layer of baked beans at the bottom of the level acting as lava, possibly referencing the several images of random objects containing beans. There are also several Boos throughout the level for the sake of making the level connected to Boos. On top of the steering wheel is a Big Boo, the titular Big Boo that owns the car because if there isn't a Big Boo then this isn't a Big Boo level. This Big Boo for some reason has like 100 health, and drops Big Boo's Car Keys when defeat.

Big Boo's Car Keys
When Big Boo's Car Keys are collected, they can be put into the steering wheel. This will cause the game to randomly turn into Mario Kart Wii and allow the player to drive the car around Big Boo's Restaurant's carpark. However, the Wario Applorplarginartiyation will appear and eat the player, causing the cartridge to turn into a copy of Wario Land 64, because you gotta be coo-coo crazy to think you still want to play Mario 64 at this point. Get it? It's a joke about the quote from the thing the Wario Apparition came from- I'm tired, I need to stop typing and go take a nap.

Missions
According to some reports, the level can sometimes be personalized to have a single mission available, only accessible after acquiring Big Boo's Car Keys. The mission is reportedly named "Mario Commits Vehicular Manslaughter". In this level, the player is given access to another drivable car referred to internally as "2001 Honda Civic". To obtain the star, the player must drive the car over as many enemies as possible within a minute. If all conditions are met, Mario will grab the star before the police show up and arrest him.