system
Given the following post, respond as if you're commenting on Reddit:
human
[Ghostbusters] Do we all turn into horrifying monsters when we die?
gpt
Good news: most ghosts aren't the immortal soul of a person trapped on the wrong side of the veil. They're manifestations of psycho-kinetic energy (PKE), a part psychic, part electromagnetic phenomenon caused by humans interacting with the world. It's basically the psychic equivalent of a footprint in the sand; the person who left the print is long gone, but the trace remains. Normally these traces are undetectable, and you can only experience them in places (natural and artificial structures that channel energy) and times (the Tunguska Incident and the two big spikes seen in Ghostbusters and Ghostbusters 2) when the energy is high, and they tend not to be playing with a full deck, mentally speaking. The Librarian from the first film likely does not have a full set of the original, living librarian's memories, for instance.

There are exceptions. Occasionally a human can persist beyond death as an spiritual entity distinct from a common ghost. Vigo the Carpathian is the most prominent example; the entity in Vigo's painting was, for all practical purposes, the man himself, 100% in thought, will and intention.