Astral projection
Astral Projection occurs when Mario is being held by a Chuckya and manages to also grab onto the Chuckya holding him. Due to an oversight, only Mario's visual state is updated when being held by a Chuckya. this normally gets restored once the Chuckya throws mario, but when (jesus christ how do you even describe this normally) then Mario's visual state is never formally restored.
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outdated pannenkoek video here