In Ghostbusters, the ghosts leave behind slime ("ectoplasm"). Why would ethereal beings leave behind slime? What's the in-universe explanation of this?
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1Out of universe - sort of - wikipedia has an article about why ghosts leave behind ectoplasm. Although it doesn't sound like the same type of stuff in the movie. – Izkata Jun 17 '12 at 04:56
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An in-universe explanation for "ghosts are made of ectoplasm, which sounds like it should be slimy"? Sorry, no. – Gorchestopher H Jun 17 '12 at 18:01
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Per Tobin's Spirit Guide:
Ectoplasm: A thick, viscous substance, ectoplasm is formed when ghosts interact with the physical world. Usually seen as a viscous, mucuslike slime, ectoplasm has also been encountered in mistlike and even crystalline forms.
Ectoplasm Residue: identifies areas of paranormal contact or interaction. While some ectoplasm can be seen with the naked eye, Ectoplasmic Residue can only be seen while using the P.K.E.-enhanced Paragoggles.
Both are from Ghostbusters: The Video Game (realistic version), the last I heard, this version is considered canon by Dan Akroyd
From the Ghostbuster's wiki page for Ectoplasm:
