* Was anybody else ever bothered by the spiritual ramifications of what the Ghostbusters do? Think about it - if the creatures they are fighting are the actual spirits/souls of dead people, rather than demons or some other form of EldritchAbomination, then aren't the Ghostbuster's effectively binding souls in such as way as to prevent them from moving on to whatever awaits them in the afterlife whenever they trap a ghost and put it in the containment unit?
** I don't think any proof is ever offered in the first movie outside of human speculation that the spirits you see are actually dead humans. They usually manifest themselves more like demons, or creatures than the spirits of lost relatives.
*** The notes for Slimer in the game suggest that several and/or most of the ghosts they deal with are manifestations of common emotions or impressions rather than belonging to a single individual.
*** That would explain why Slimer eats so much; he's a manifestation of hunger!
** Do you also complain when cops catch crooks? The Ghostbusters do the same thing, only, the crooks they catch are already dead. (BTW, I think this would've been an excellent rebuttal for Neil Anderson when April complains about the exact same thing in Return of the Ghostbusters)
** Doesn't the fact that the ghost exist imply that the spirit/soul of the dead person was NOT going to move on? The first ghost they see is the one in the library. And it seemed to be implied that it was haunting the place for a number of decades. More than likely, the 'free' spiritual options were exhausted before anyone bothered to call up the Ghostbusters to pay them ($5k+) to take care of the problem.
*** Granting that there probably are some troublemakers who have been actively avoiding moving on to Hell or some other unpleasant parallel dimension, I can't help but be disturbed at the thought of some kindly old grandfather who stayed behind to watch his family winding up in the supernatural equivalent of jail because Venkman started thinking about profit margins instead of helping people move on.
*** Grandpa would have to be doing something more than simply "watching his family" to even come to the attention of the family, and makes sense that it would have to be something unpleasant for the family for them to call in the Ghostbusters and pony up that kind of money.
** They're also all ''batshit insane.'' The cartoon touched on this more than once, the idea that ghosts who don't actively cause trouble aren't actual targets for the Ghostbusters, and I'd wager a guess it's the same in movie canon, it's just that nearly all the ghosts we see on-screen are completely anti-social psychopaths who are capable of influencing the physical world enough so that they can easily ''kill people.'' The presentation is ''just'' family-friendly enough to avoid any direct discussion of this topic, but it's plainly obvious that these things are, at best, interested in nothing more than interfering with the living, and at worst, complete monsters. William Atherton, playing Walter Peck, came close to suffering serious injuries when they dumped the fake marshmallow goo on him. Now put this in the context of the fiction; a lot of ghosts don't show any human behavior, they just rampage about wrecking stuff, which has the side-effect of putting living people in harm's way. If you're comparing the containment unit to a jail, then there's absolutely no reason not to compare the ghosts they throw in there to ''criminals,'' who have never shown signs of being capable of rehabilitation. Whatever was human about them is gone, assuming they weren't crazy to begin with like the Spiderwitch. Compare to Eleanor Twitty; they never ''went back'' to the library after her once they had ghost traps and proton packs, there was no need. She was just a kindly old lady keeping her books arranged from young, careless whippersnappers. Why does this change in the game, where they go back to get her, ''years'' later? She's ''animating books into goloms and flying bats that attack people.'' Slimer? Not in the containment unit either. They mention he's made a past time out of staring into the containment unit's viewer, which means they also let him out of his cage in the lobby, too, just not always since he's prone to making a fuss. When he ''does'' make a fuss, he only poses a threat to people who get in the way of any food he sees. Look at the drawings left by the schoolchildren who took a field trip to the firehouse; some of them were obviously pleased as all get-out that they got to ''feed'' Slimer, so there's some plain-as-day established facts here they ''do'' take a ghost's behavior into consideration. It's not at all a stretch to imagine that in the grandfather example above, they would actively refuse the job in movie-canon just like in the cartoon (where Venkman wasn't really any less of a jerk,) instead taking on the task of explaining to the family what's going on in such a way that they accept it, and/or helping the ghost let go and move on. I think it's safe to say that morality isn't absent here, it just doesn't get any screen time since it's not a terribly philosophical setting.
*** In addition to that, what else could the Ghostbusters do to the entities they catch? Ghosts are indestructible on their own, so the only option is to remove them. As the movies have shown, the [=GBs=] don't know of any way to force a ghost to cross over if it doesn't want to and any attempts at reasoning with violent ghosts are met with nothing but attacks. True, shoving a bad ghost into the same place as evil gods might seem harsh, but there's really nothing else to be done. The choices are either the Containment Unit or leaving an immortal, invincible psychopath out where they can do harm.
*** The comics actually mention this several times. They talk about the ghost of a little boy who they were sent to bust by the family currently living there. But they realized he just wanted to use the family's TV, so they agreed to let him stay as long as he didn't cause any trouble. There's also another example where the ghost of Major-General Anthony Wayne is preparing to invade Canada because he believes that one last victory will finally allow him to move on. Winston, being a former military man himself, tells him that it's not a good idea, and convinces him to get into the trap voluntarily because it's the closest thing to the peace he seeks that they can give him.
** The cartoon also goes into how ghosts are sort of a PKE impression people sometimes leave behind when they die, and not the actual person. It's not always consistent with itself (especially in the later seasons), but enough episodes have revolved around a massive PKE surge taking on the shape of some nearby psychic impression and becoming a ghost (for example, the ghostbusters' PKE-infused original jumpsuits, or Murray the Mantis, or the Scoleri Brothers being created by the mood slime in ''Film/GhostbustersII'') to suggest that ghosts are TheHeartless rather than human souls.
*** Agreed. They are made of ectoplasm, a spiritual substance formed from powerful emotions. Much like the constructs from GreenLantern, most of the ghosts can be thought of as just wild animals formed from concentrations of emotions in an area. Given that they are made of powerful emotions, they probably act to increase powerful emotions in the area in order to feed. And what's a powerful emotion? Fear.
*** Some are otherworldly beings while others are merely inhuman collections of PKE, but the more humanoid ones appear to actually BE the human that they once were. The main reason we don't see many good (sane) ghosts around is because most good people don't actually BECOME ghosts without outside interference.
*** "The more humanoid ones appear to actually BE the human that they once were." They may ''appear'' to be, sure. There is no evidence (and certainly not in the films) that they actually ''are''. The films are very much rooted in the modern parapsychological view of spectral activity, which very much refuses to view ghosts as souls. In such views they're more like residue left by living beings than the actual beings themselves.
*** There is one episode that may cover this, Who's Afraid of the Big Bad Ghost. They get called to bust a ghost by a ghost who doesn't realize they died. Comments are made this isn't the first time, and the ghost moves on after their business is finished. I believe the same thing happened in Citizen Ghost when they found the sled.
** All of the above notwithstanding, several episodes involve the Ghostbusters dealing with the actual spirits of several famous dead people (Harry Houdini, Casey Jones, and an {{Expy}} of Agatha Christie) who are causing problems for the living. How do the Ghostbusters get rid of them? Simply by helping them complete their UnfinishedBusiness. They help Harry Houdini catch the guy who had stolen his tricks, they help Casey Jones prevent a train crash, and they solve Agatha Christie's unfinished mystery novel. The Ghostbusters are effectively "busting" them without needing to use their proton packs or traps.
** A quote from Egon's notes in the video game ([=PS2=] version, which has Egon's spirit guide commentary as one of its admittedly few selling points): "Her name was Eleanor Twitty. With all the havoc manifestations cause, it's easy to forget that a lot of them originally came from the psychic imprints of human beings. I don't believe that there's much of anything left of a 'soul' or whatever at this point, but it's still an unnerving concept to ponder if you let your rational guard down." Admittedly, Egon's a rationalist who likely doesn't believe in souls at all; Ray would probably have a different take on ghosts and whether they used to be people, or they're just based on people.
** The only ghosts that are even based on once-living people in the films are the Scolari brothers, and it's more probable that, given the properties of the pink slime in the courtroom scene, they were a psychic manifestation tied to the judge that sentenced them rather than the brothers' actual souls. Everything else is usually just some kind of violent, inhuman spirit. That ghost from the library is obviously a shape-shifter, so its librarian form could have very well been a mimic of a living person that it just saw the week before.
*** The game has you deal with the librarian as a boss and the notes( and subsequent boss battle) state she was alive 50 years ago but was killed protecting a rare tome from a demigod known as the collector (the aforementioned boss) wether her existence is typical or a result of irritating a level 5 demigod is unknown.
*** What about the Titanic and its passengers?
*** How do we know it's the real Titanic? The ship itself never made it to New York, so why should it be activated by the pink slime? The disaster was famous, so it's very likely the Titanic that pulls into port is recreated by the malevolent slime feeding on peoples' subconscious knowledge of the event to freak them out.
*** Or maybe the original sinking created a variety of ghosts, some of which had ''completing the voyage'' as their UnfinishedBusiness. They flew to New York and hung around intangibly near the docks, but weren't strong enough to actually manifest until the pink slime gave them a power-boost.
*** Given the occasional (if inconsistent) remarks in the franchise about ghosts being energy impressions rather than real souls, OurGhostsAreDifferent is probably the simplest and safest explanation for this IJBM. However, if you need to theory that works with the more traditional view, there's nothing to say ghosts can't "move on" from inside the containment unit. It might even provide extra motivation to do so.
*** Most of what the Ghostbusters do is deal with ''unpleasant'' ghosts. If kindly old Aunt Agnes likes to manifest and chat from time to time, there's no real reason to call someone and pay them exorbitant amounts of money to get rid of her.
*** Yeah, you'll notice that we never see them bust Fiorella [=LaGuardia=]. All he did was show up and have a long chat with the current mayor. He wasn't into wreaking havoc, and as a result we never hear of him being contested.
*** Although, in a valentine's day strip, Winston convinced a ghost to cross over by having a chat about how many people have suffered heartbreak, and how it does not give him an excuse to haunt an apartment.
*** I haven't read that strip, but it sounds like in that case the heartbroken ghost was probably making a bit of a nuisance of itself in some way though. What's being suggested here is that if the ghost isn't really causing any trouble and the people around aren't really bothered or negatively impacted by it, there's no real reason to hunt it down.
* Why don't the Ghostbusters put more research into a permanent way to get rid of ghosts? The Containment Unit has been proven to be a massive liability as every single ghost to get near the firehouse outside a trap tries to take a swipe at it. Seeing as they have demons, evil gods, and who knows how many plain vanilla ghosts just itching to cause Armageddon and able to wait thousands of years for it, you'd think they'd be spend at least a few weekends in trying to find a way to force them into a less fragile plane of existence than ours.
** Quite simple really, by the time the containment unit is forced to explode or open by outside forces the ghost free warranties they've given out have expired. Also it would probably cost a lot more to find a way to shove ghosts into another dimension or otherwise permanently remove them than it would be to simply capture them again(for a fee of course). If the good people of New York were willing to fund that endeavor I'm sure the Ghostbusters would turn a good portion of their research to it. The Ghostbusters are a company like an insurance company, not a charity.
*** True, but it cannot be a good idea to risk having so many powerful beings with a grudge against humanity in general and you specifically loose at once.
*** No one ever claimed that men who strap nuclear reactors to their back for a living had any common sense.
*** Might be worth noting here that Mankind ''also'' hasn't figured out how to dispose safely of hazardous waste materials from nuclear reactors which ''also'' last several thousand years or so. It doesn't stop society at large (a) generating further such waste products or (b) storing it with the best technology available at the time. Granted, it's not the same thing as chaining down Eddie Munster's vengeful spirit for all eternity, but it was also TheEighties.
*** Who says they don't try? Maybe they just can't do it with present technology.
*** The cartoon says they do. Egon's soul was sucked out and replaced by a demon while looking into other dimensions. Slimer was put into a giant centrifuge device that was supposed to destroy ghosts. Given Extreme Ghostbusters, they never found a workable alternative in 20 years.
*** In "Robo-Buster", Egon says outright that it's ''not possible'' to destroy ghosts; attempting to do so would merely scatter their PKE energy, and it'll just come back later as something else. That would also explain why the Slimer example above would still be a legitimate concern while still maintaining the premise that only containment is viable; Slimer could be destroyed by the centrifuge, but his PKE energy would just come back again later, and whatever it comes back as would probably no longer have the personality and morality that made Slimer an ally instead of an enemy.
*** [[{{Anvilicious}} Might be they were trying to tell us something.]]
*** If you have to wonder if they were trying to tell you something rather than it being blindingly obvious to everyone that they were, it wasn't an anvil.
** What bothers me more about it isn't that someone with a grudge can shut the containment unit down, it's the the containment unit isn't a passive system and as such will inevitably, perhaps much later then sooner, but inevitably ''fail on it's own'' without outside tampering. If another "they did it in the cartoon" is still worth some speculative value instead of being a cop-out at this point, they...well, did this in the cartoon with an episode having Egon make a portal to the Netherworld, actually saying that the containment unit would one day run out of space. It didn't go well, but the issue was never brought up again. Of course, the solution to that seems to be quite simple and would effectively be started in any hypothetical spinoff to the game; build another containment unit.
*** Besides that, the ghosts in the Containment Unit will presumably last for eternity. The neither the unit nor the Ghostbusters as a company will. This means that the Ghostbusters are essentially leaving an army of madness and evil [[SealedEvilInACan locked up]] in a manner that could prove [[NeglectfulPrecursors hazardous to humanity for eons]].
*** If we use the cartoon to fill in the gaps (and since I love the cartoon and think the [[Creator/JMichaelStraczynski JMS]] seasons were very faithful to the movie's mythology, that works for me!), they were working on a permanent solution. A rival businessman even tried to compete with them when he thought he'd come up with the answer (of course, it turned out he was dangerously wrong and they had to clean up his mess). I'd chalk up the lack of onscreen worrying to RuleOfDrama: watching Ray and Egon having a {{technobabble}} debate while Peter and Winston watch TV in the background would just be boring. At least, it would in theory - I'd pay good money to see that...
** At least as far as the original films go, long-term safety considerations were likely not taken into account because these are films where [[TheEighties people who stop dangerous supernatural entities for cash are heroes, private businesses automatically are morally superior to the government, and the EPA is the bad guy]]. Including any indication that Ghostbusters should have felt responsible for the accumulating waste-product of their particular industry would have interfered with the first film's ability to be a rags-to-riches love song to good old fashioned capitalism, and second film's ability to be [[TakeThat a rehash of one]].
** The Ghostbusters never say in the films that the containment system they currently have has to be a permanent solution, only that SIMPLY shutting it off would be catastrophic. The presence of the word "simply" indicates that they have indeed considered the long term and have a safer alternative should the need arise.


* In both movies, but especially the second, the Ghostbusters are accused of being a farce, and yet they're scientists. Wasn't there something in science called peer review? Why don't any of the research scientist/inventor ghostbusters suggest having an independent group of scientists look at their projects to confirm their legitimacy? The most blatant example in the second movie is the river of slime. Here's an idea: Send someone else down there. Give Ray a camera before you send him. Invite James Randi over and collect your cool million. I can understand the immediate threats, but there are long stretches where they could have allowed a scientific investigation to allay suspicions.
** In regard to the river of slime, even if they had convinced the authorities of its existence, what could they have been done at that point, other than put more lives in danger? Vigo was already so powerful that he could have sent dangerous monsters and other manifestations to hinder any efforts to block or control the river by the authorities, just like he did when the ghostbusters themselves went down there. Teams of sewer workers would probably end up driven mad, possessed or killed by Vigo's minions. If they had alerted the authorities about the painting (and convinced them to its threat), Vigo would just blast anyone who attempted to move it or destroy it, and order Janosz Poha to move it to a more secure location. Only the ghost busters alone could stand any chance of stopping him.
** The Ghostbusters were kicked out of the University because they were lousy scientists. "Your theories are the worst kind of popular tripe, your methods are sloppy, and your conclusions are highly questionable. You are a poor scientist, Dr. Venkman." They went into business for themselves with proprietary technology they invented, using methods they want to keep secret from others. No way are they letting anybody else break their monopoly.
** Considering the subject of their theories (i.e. ''GHOSTS''), it's probable that they couldn't get anybody to take them seriously enough for an effective peer review before the movies. As for what happened after the movies, I can only imagine that the importance of the Ghostbusters' discoveries (new nuclear models, micro sized fission reactors, ''possible confirmation of the afterlife'') is downplayed because the writers don't want to deal with the messy implications of their work. [[ReedRichardsIsUseless There is a precedent for such things, after all]].
** And besides, according to the J-REF themselves many people can't force themselves to wade their way through the sometimes year or two of red tape involved before they can so much as ''sit down and actually have the million dollar challenge test''. Yes, even if it involves simply going somewhere else, there's still a lot of legalities involved with that much money. It's a long and arduous process and New York would be long since doomed by Vigo by the end of it.

* I know Ray Stantz said to Peter Venkman, "Don't move it won't hurt you.", when staring at Slimer. But why didn't Peter Venkman RUN when Slimer came after him? Ray's advice be damned. Peter wasn't exactly trapped in a Dead End and could have easily turned the corner right behind him. Taking a few steps back then just standing there screaming is not exactly escaping a slime bath.
** He was paralyzed with fear. Apart from the librarian, that was the first ghost Peter had ever seen, and this time he was all alone with it. He just lucked out in that the ghost happened to be, well, Slimer.
** Run where? Slimer is clearly faster than any human being ''and'' can pass right through solid matter. Where could Venkman possibly hide from him?

* The filmmakers said that they way they thought about the Ghostbusters when they made the movie was that the group was like a single entity, Ray being the heart, Egon the brain, and Venkman the mouth (voice). Where, then, does Winston fit in? What part of the entity is he? The soul...?
** I hate to say this, but apparently he's the spleen.
** I'd say the arms/body or something similar. At least in the first movie, he's not a scientist like the others, but he's a hard worker and the everyman.
** Or maybe the eyes, since he's the AudienceSurrogate who brings an outside perspective to the group and keeps them grounded in practical reality. That especially fits with Peter being the mouth: Peter takes the Ghostbusters' POV out to the world, while Winston brings the rest of the world's POV to the Ghostbusters.
*** The cartoon makes it clear that he's the hands. He does almost all the driving, is stated to be the best shot with the proton pack, and is often seen helping Ray and Egon with their various projects and inventions when he's not doing basic repairs on more mundane things.
*** Louis is the appendix. He's a part of the team, but no-one's quite sure why.

* When Venkman and Peck first meet, why didn't Venkman just show Peck the containment facility? If it was just Peck and Venkman, no cops or electricians, Venkman could have just bullshat his way through explaining that it was safe and Peck would have a much harder time convincing anyone else that he had probable cause to prosecute.
** Because while Peck might have a point about his concerns about the containment facility, Peter ''also'' has a point that this guy has no right -- legal or general -- to suddenly appear in his life and start arrogantly throwing his weight around making demands and threats. Plus, considering how Peck later shouted down the Con-Ed guy who was also making noises about how it might not be safe to shut it down, chances are showing Peck around might have strengthened his convictions to get everything shut down; he's not exactly an open-minded guy.
** The novelization states that Peter was exhausted from multiple shifts of ghostbusting and lost his temper.
** In addition, Peck is apparently not aware that "magic word" means "please" until explicitly told so. Even then, his tone of voice when he says "please" doesn't exactly scream "polite and considerate". Peter likely thought that he was an asshole and there was no reason to humor the guy whatsoever.
** While Venkman probably could / should have just bitten the bullet and let Peck take a quick look (if only to get him off their backs for a while), Peck doesn't exactly conduct himself in a way that's calculated to win Venkman over. Chances are, had the EPA sent around a pretty woman, or even just a more reasonable guy who wasn't a total dickhead, Venkman would have had no problem showing off the containment grid (or at least would have probably framed his refusal in a more diplomatic, less confrontational way). His issue seemed to be more with Peck being a pompous jerk rather than opening up the Ghostbusters facilities to inspection.
** Even in the film, Venkman is clearly exhausted and in no mood to put up with bull. His coping mechanism for stress is humor, and Peck turns out to be the perfect target for Peter's brand of jerkassery. And Peck isn't the kind of guy to respond well to that, and takes personal offense. And of course, Peter was highly offended by Peck right off the bat. "Exactly what are you a doctor of, ''Mr.'' Venkman?" Not using a person's proper salutation is a really good way to get on their bad side, and Peter wasn't about to take Peck's dismissal lying down. As has been pointed out, if Peter had been in a better mood, had Peck been less of a jerk, the whole thing could have been settled amicably (well, up until Peter got to the unlicensed nuclear accelerators, at any rate).

* The question always bothered me: how did Vinz Clortho know "the signal" would have been the release of the ghosts from Ghostbusters central. Could he read the future ?!?
** No, you're misunderstanding it completely. He didn't know, in advance, that the signal would be that exact event. He was waiting for a signal, any signal, which would mean Gozer was returning. I'd say the huge plume of ghosts exploding out of one place and going on to rampage throughout the city can be pretty easily interpreted as such a signal.
** When he's talking to the horse, he says something like, "Soon all our prisoners will be released," which could only refer to the containment unit. Maybe if Peck hadn't shut it down, the ghosts would have escaped soon anyway.
** Maybe he ''could'' read the future. However incompetent Gozer may have been (his servants certainly were--judging from Vinz's antics with the horse and at the firehouse, and that Zuul didn't even seem to recognize Peter was the same man who'd just said he wasn't the Keymaster or understand what he was doing since she (?) let Peter inject Dana, they had the intelligence of dogs or less as well as the appearance), he was still a god. Deities tend to have divinatory powers, and one who was summoned periodically to destroy a world would need to be able to see the future to know when the time was right and all prophecies/rituals had been fulfilled.
*** To be fair, the fact that Zuul can't tell that Peter is the same guy who just said he wasn't the Keymaster may not indicate incompetence so much as foreignness. Remember, Zuul is some sort of demon-dog from another dimension. When they were still in dog form, could you tell the difference between Zuul and Vinz Clortho? They probably can't tell the difference between human beings either. They may also have a different sense of time, so from Zuul's perspective, the fact that sometime after a human who said he wasn't the Keymaster left, another human who said he was the Keymaster arrived. Did they look alike? Well, all humans look alike to them. How much time passed? Hard to say, time passes differently here. They also might not exactly know who the dominant species on our world is. The horse was larger and in front, so maybe Vinz just assumed that he must be the one in charge.
*** Also, the demon-dogs possess people. For all Zuul knew, Vinz Clortho could've jumped Peter the second the door was shut and taken over his body.
** New theory - Zuul was told to wait for Clortho, Clortho was told that he had to find Zuul and that the sign would be a pillar of light and that "all prisoners will be released." However, he didn't know the context - the containment field being shut down and the ghosts busting loose. He knew ''what'' would happen, just not where or when it would happen.

* At the end of the first movie the Ghostbusters send back Gozer to his hellish reign. That means that any ghosts who infested New York would vanish (he was just Gozer's doing who created the Mandala if the ghosts started plaguing the city). Nevertheless Slimer doesn't vanish, in fact you can see him floating towards the camera before the credits, and he stays at New York until Vigo's return. WHY ?!?
** The building didn't create the ghosts or summon them from the afterlife, it just attracted them to New York.
** The hotel manager said that staff had known that the ballroom where the guys fought Slimer was a spooky place for a long time, just never as bad as it'd recently become. Slimer had been haunting the hotel all along; the cross-rip merely increased his power enough that he could start manifesting and nomming corporeal food. When Gozer got banished, the little green glob presumably lost that power-boost, flew home, and resumed harmlessly haunting the ballroom.

* Why can't you look directly in the trap?
** Maybe it's just a safety precaution, due to a few uncertainties about how it works. At one point Egon goes "I looked in the trap, Ray!" and he seems to be fine afterwards.
** Alternatively, the "Return of the Ghostbusters" fan film gives the explanation that Ray theorized that the eyes were literally the "window to the soul" and that a person looking into the trap while it's closing will cause the trap to pull that person's soul into it.
** It's really really bright and could hurt your eyes.
*** That actually makes sense. If you're firing a proton stream at a ghost and everything around it, the ''last'' thing you want is flash-blindness from looking into the trap.
** On that note, perhaps the trap is as dangerous to the eyes as looking at the sun/a solar eclipse. Or, since Egon seemed just fine afterward, either he didn't look long enough or it's not ''quite'' as bad as that, but close.
** Presumably Ray himself had avoided looking directly at the trap when he was testing the device, so couldn't judge precisely ''how'' bright the light it emanates is. He was warning the others not to look as a precaution against what ''might'' be bright enough to blind someone. Luckily for Egon, it wasn't quite that intense.

* Why do the ghosts run from the particle beams? Even Gozer avoids them as powerful as it is. Did they know that it could catch them before the Ghostbusters did? Just doesn't make sense to me as to why they would run and try to avoid the beams when nothing else has been able to touch them up to this point. Or maybe the Busters are just really, really bad shots after all. The only ghost we see that really doesn't result in massive damage(When beams are involved) in its capture is Vigo, but they don't really capture him in a trap or anything.
** Why do people duck or run when someone fires a gun at them? Preservation instinct. Presumably, the ghosts ''do'' sense that the beams are in some way harmful or debilitating to them. Regarding the 'Busters being bad shots, to be fair whenever you see them firing the particle beams they're clearly struggling with them; they're obviously not easy to direct or control.
*** The beam from a proton pack seems incapable of shooting in a straight line, explaining the Ghostbusters' bad shooting.
*** As Dan Aykroyd said in a documentary, it's "a thousand times more powerful than a fire hose."
** As to why ghosts seem to instinctively fear proton-pack beams, we really have no clue how such beings perceive their surroundings. It's likely that they can sense energies emanating from the beams and thus perceive them as dangerous before they're actually hit by one, the same way a human might feel heat radiating off a hot object and refrain from picking it up.

* One thing that's bothered me since I was a kid: how do the busters ''avoid'' crossing the streams? Have you '''seen''' those things? I'm not even sure how they ''aim'' with the beams lashing every which way.
** Judging by how much effort the Ghostbusters visibly have to put into crossing the streams at the end, it seems to me like the streams naturally repel from each other (sort of like how a magnet repels from another magnet), so they don't have to worry much about accidentally crossing the streams; what Egon is cautioning about is ''deliberately'' forcing the streams to cross as they did at the end.
*** This actually makes perfect sense. Their devices produce streams of protons, which are by definition positively charged particles. Identical charges repel one another. Crossing the streams would have likely caused a repulsion effect which would collapse all stream integrity, throwing protons in all directions at even greater velocities than normal proton radiation, causing... Bad Stuff.
*** But in that case, why would Egon have to warn everybody, as if it was something that could happen by accident? Hell, if we're talking protons here, how could they even do it ''deliberately'' without a hadron collider? I don't think the four Busters can match the Strong Nuclear Force with just their arms.
*** Not the strong nuclear force, just electromagnetic force. Protons have a positive ''electric'' charge, which is what makes them repel each other. The SNF is what prevents protons from repelling each other in the nucleus of an atom, and I'm not sure it even has poles. You can shove, for instance, the north pole of two magnets together, depending on how powerful they are, it just takes effort. (Also the SNF only works on like the femtometer scale anyhow.)
*** He's warning them because it's something incredibly dangerous regarding the proton packs that he thinks they need to know about. Since it clearly ''is'' possible to cross the streams (albeit with some effort), he wants them to be aware of the danger in doing so that they don't, say, decide it might make catching a particularly tricky ghost easier if they cross the streams one time only to end up destroying the universe. As for how they cross protons without a hadron collider... look, we're dealing with a science fiction horror comedy about a gang of scientists chasing ghosts here. We're already well outside the parameters of accepted mainstream physics on this one. Even on the Headscratchers page, at some point you do either have to let your WillingSuspensionOfDisbelief take over or just give up. Just call the proton packs mini-colliders that Egon invented and have done with it.
** In the video game, they use the cross-the-streams tactic in the finals phase of the story, and Egon can be heard saying that he's deactivating some kind of protective anti-crossing field just prior to them forcing the particle beams together. Presumably he'd added such a precaution not long after their first fight with Slimer, once it became clear just how erratic the streams' trajectory was.

* Dr. Ray Stanz refers to Slimer as "a focused, non-terminal, repeating phantasm, or a Class Five full roaming vapor". What is the 'non-terminal' part supposed to mean?
** Possibly that Slimer's appearance doesn't recapitulate the way he died, the way the executed brother-ghosts from ''[=GB2=]'' popped into existence sitting in the electric chairs that killed them.
** Also possibly that he's non-lethal; he causes a lot of trouble and being attacked by him isn't incredibly pleasant, but Venkman pulls through it more or less unharmed.
** In the animated series, at least, it's clear that [[OurGhostsAreDifferent the creatures referred to as "ghosts" are both the spirits of dead people and creatures from another dimension]]. I always assumed "non-terminal" referred to the latter (Slimer sure doesn't look like the spirit of a dead human).
*** Except it's puzzling that the guys could've deduced that ''before'' they'd gotten Slimer trapped and back to the lab.
*** He might just be making an educated guess based on what he knows about ghosts in general (i.e. he hasn't fully confirmed it with testing, but based solely on observation Slimer shows recognizable signs of being a 'non-terminal' entity, whatsoever that might be). It's not exactly strictly following the scientific method, granted, but Ray ''is'' a legit expert on ghosts, so it shouldn't be too much of a stretch that he might be able to make some pre-emptive deductions about what kind of ghost they might be dealing with just from observing it; same as how your doctor might start narrowing down what your condition might be just from hearing you describe the symptoms before conducting the full examination. Furthermore, the person he's talking to is a non-expert anyway, so who cares if Ray's jumping the gun a little bit? He's trying to sound knowledgeable so the guy will be impressed by his expertise and thus will cough up a generous pay-check, and it's not like the guy's gonna follow up on their test results or peer-review their research or anything.
*** Although if AllThereInTheManual sources are to be believed, Slimer apparently ''was'' the ghost of a human who died in the hotel, FWIW.
*** "Non-terminal" could mean that he's not confined to one location or terminus (unlike other ghosts? Perhaps most of them stick to the place they died at) or perhaps he is in no danger of fading away/terminating by himself (again- unlike other ghosts?)

* Why would crossing the streams cause the end of the universe? Iím not a physicist but I find hard to believe that two or more proton streams would have such a grandiose effect. A terrible large explosion or the dead (maybe disintegration) of the people shooting the streams, yes. End of all life as we know it? No, and if they are then how the hell are they walking around with Doomsday devices that can cause the CessationOfExistence of the universe?
** Actually thereís a fan theory that says that this is how the Ghostbusters defeated Gozer; by destroying his universe. As they crossed the streams pointing them toward Gozerís dimension. Now, about HOW crossing proton streams can destroy an entire universe I have no idea because Iím not a physicist. I can believe that crossing protons streams is a bad idea and would cause a massive explosion that will kill a lot of people around, but all life as we know it?
** In the Video Game, it's mentioned that crossing the streams only worked due to the presence of a cross-dimension portal and it should only be used as a last resort. Alternatively, it's possible that Egon could have simply been mistaken about the ramifications, or he was just exaggerating.
** Egon did say, ďthe end of life as we know itĒ which could be interpreted to me complete destruction of reality or simply their own deaths. The way he described it was something to the effect of every atom in your body reversing charge and exploding, what Ray thought they did to Gozer briefly before the whole choose your destructor part. Presumably all he meant was that if you cross the streams your atoms will detonate scattering your subatomic particles in a burst of radiation which for you might as well be the end of the universe or otherwise enter some other unpredictable state besides death since they're tampering with forces beyond current human understanding.
** In ''WesternAnimation/ExtremeGhostbusters'', Egon tells Eduardo that crossing the streams results in a nuclear explosion. Nuclear explosion + large amounts of eldritch spiritual energy? Yeah, I can see how that would happen.

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