[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/ArsenicAndOldLace.jpg]][[caption-width-right:300:"There is a Happy Dale, far, far away..."]]
->'''Mortimer''': Look, you can't do things like that! Now, I don't know how I can explain this to you. But, it's not only against the law, it's wrong!\\
'''Martha''': Oh, piffle!\\
'''Mortimer''': It's not a nice thing to do. People wouldn't understand. ''He'' wouldn't understand! What I mean is... Well... This is developing into a very bad habit!

''Arsenic and Old Lace'' is a 1939 play by Joseph Kesselring, a BlackComedy parody of murder mysteries. It was adapted for the big screen as a 1944 film directed by Creator/FrankCapra and starring Creator/CaryGrant.

Theatre critic Mortimer Brewster doesn't realize it, but he is the [[OnlySaneMan most normal]] member of his family. He has two sweet old aunts, Abby and Martha, who like serving homemade wine to lonely old men... and sometimes put arsenic in it. As the action opens, Mortimer has decided to surprise his family with his marriage, and shows up with his new bride Elaine on his aunts' doorstep.

Unfortunately, no sooner is he ensconced in their parlor than Mortimer accidentally uncovers the dark secret of the Brewster insanity. Since all the bad things his family does, or almost all, are directly related to [[InTheBlood hereditary madness]], he has to try to keep them out of trouble even as [[UnusualEuphemism "Yellow Fever victims"]] start piling up in the basement, buried there by his blatantly insane older brother Teddy. Trying to keep his bride Elaine in the dark while also keeping her safe, he stuffs her back into her old room in her father's home next door.

Then his older brother Jonathan returns after a long exile and some plastic surgery... and things get truly dangerous.

----
!!The film and play contain examples of the following tropes:

* AccidentalMisnaming: Teddy, being a bit nutty, doesn't remember the name of Happydale's director correctly.
-->'''Teddy:''' Mr. Witherfork!\\
'''Witherspoon:''' Spoon.
* TheAlcoholic: Dr. Einstein drinks to "calm his nerves", which he needs a lot with Jonathan around. Jonathan's scarring is due to Dr. Einstein being drunk while performing plastic surgery.
* AllHallowsEve: An opening title introduces the film as "a Halloween tale of Brooklyn", and the Brewster sisters are seen handing out pies and pumpkins to a gaggle of trick-or-treaters.
* ArtisticLicenseSports: The movie opens with a fight breaking out during a Dodgers-Yankees baseball game... played ''on Halloween'', which would have been comically ludicrous in the early 1940s when the World Series was played in the first week of October.
* AsideGlance: Mortimer frequently addresses the camera with his eyes, most particularly in the scene where he's being tied to the chair. His stare at the audience serves to lampshade the LampshadeHanging.
* AxCrazy: Jonathan is a psychopathic murderer who travels the world only a few steps ahead of the police. He'll kill you for any reason, or no reason, but especially if you tell him he [[BerserkButton looks like Boris Karloff]].
* BackAlleyDoctor: Dr. Einstein is a back alley plastic surgeon whom Jonathan keeps around so he can change his face as needed.
* BeneathSuspicion: Who would suspect two sweet old maiden aunts of being serial killers? Certainly not the Brooklyn police, who pay them social visits on a regular basis, nor their neighbors, nor even their psychopathic nephew. Mortimer only figures it out through stumbling on their latest victim.
* BetterThanABareBulb: Thanks to being a theater critic, Mortimer's dialogue is sprinkled with references to how characters in plays act or ought to act in various situations, which are of course precisely applicable to the situations he finds himself in. Unfortunately, [[GenreBlindness he doesn't realize that he, himself, is a character in a play.]]
* BerserkButton: Saying Jonathan looks like Creator/BorisKarloff will get you strangled at best, and slowly tortured to death for hours at worst.
* BewareTheNiceOnes: Abbey and Martha are genuinely sweet, charitable old ladies who advertise a room for lonely old men... and then [[BreadEggsMilkSquick poison them.]]
* BlackComedy: To get serial killers and ax crazy murderers past the UsefulNotes/TheHaysCode, it was necessary to frame the story as a whimsical comedy about a theater critic discovering his family's hereditary madness.
* BluffingTheMurderer, in a DoubleSubversion. Mortimer tries to get Jonathan to leave by threatening to tell the police about his dead body. In response, Jonathan threatens to reveal Martha and Abbey's murders. Mortimer then decides to [[FramingTheGuiltyParty Frame the Guilty Parties]] by getting his aunts preemptively committed to Happy Dale.
* BodyCountCompetition: Jonathan is shocked to discover that his aunts are murderers, but even more shocked to discover that they've been every bit as successful as he is. An argument ensues over how many kills he gets to count.
-->'''Dr. Einstein''': You got twelve, they got twelve. The old ladies is just as good as you are!\\
'''Jonathan''': Well, we'll see about that. All I need is ''one more''. And I've got a pretty good idea [[CainAndAbel who that's going to be]]!
* BodyInABreadbox: The window seat is apparently Abbey and Martha's temporary corpse storage; Jonathan finds it a convenient place to stash his latest victim as well.
* BoundAndGagged: Mortimer is tied to a chair and gagged by Jonathan in preparation for torture -- Mortimer sets this up himself by describing how a victim in a play was captured. Later, when Officer O'Hara shows up, Dr. Einstein explains it away as Mortimer discussing a play, prompting O'Hara to [[RunningGag start talking about his own play]]. Mortimer doesn't get loose until he gets knocked over in a brawl between Jonathan and the police, which [[BenchBreaker breaks the chair]].
* {{Bowdlerize}}:
** At the end of the movie, Cary Grant runs off shouting, "I'm not a Brewster! I'm the son of a sea cook!" However, this was changed from the final lines of the original play, where he joyously announces, "I'm a bastard!"
** The film eliminates the play's ending gag, which has the aunts offering a glass of their wine to Mr. Witherspoon.
--->'''Witherspoon:''' You don't see much elderberry wine nowadays - I thought I'd had my last glass of it.\\
'''Abby:''' Oh, no!\\
'''Martha:''' [Handing him a glass of wine] No, here it is.
* CainAndAbel: Jonathan apparently liked to torment Mortimer when they were growing up together as children, describing the horrifying things he wanted to do to him. He seizes his current opportunity to consummate that desire.
* ChekhovsGun: When Mortimer and Aunt Abby take a moment to look at a picture of Jonathan, you know he's going to figure in the story eventually.
* {{Cloudcuckooland}}: Brooklyn is kind of depicted as being this. To the point where a title card at the beginning of the movie takes pains to distinguish the borough from "the United States proper".
-->'''Mortimer:''' (muttering to himself while the cops fight with Jonathan) All I did was cross a bridge and I was in Brooklyn...
* {{Cloudcuckoolander}}: Teddy, Abbey, and Martha are all "out there" in various ways. Teddy is of course the most obvious, and his superficial insanity serves to mask the deeper insanity of the entire family.
* DarknessEqualsDeath: No dead bodies are ever seen in full light.
* DeadMansChest: The window seat, home to two different bodies throughout the play.
* DeathByMocking:
** Barely averted for Mortimer; see GenreBlindness.
** It is implied that at least one of Jonathan's victims was murdered for saying he [[BerserkButton looked like Boris Karloff]].
* DoesThisRemindYouOfAnything: Quoth Dr. Einstein: "No, no, Johnny, not the Melbourne method! It takes too long... and it's so messy!"
* EvenEvilHasStandards: Aunt Abby readily admits to poisoning 12 men, but is outraged at Mortimer's suggestion that she would "stoop to telling a fib."
** Dr. Einstein is intimidated enough by Jonathan that he won't stand up to him, no matter how despicable the crime at hand, and has probably helped him commit a murder or two at least. But when Jonathan declares his intention to kill Teddy, the Doctor absolutely refuses and tries to physically stop him.
* EvilerThanThou: Jonathan, upon learning of his aunts' murders, insists on proving that he is a more capable SerialKiller than they are. In fact, he's not shocked at all by the murders, but instead that Martha and Abbey got away with them while living in a comfortable home in Brooklyn, whereas Jonathan has been pursued all over the world by police.
* ExtremelyShortTimespan: Everything happens over the course of a single afternoon and evening. (Which, in the movie version, happens to be [[AllHallowsEve Halloween]].)
* FailedASpotCheck:
** A RunningGag with the [[PoliceAreUseless policemen]] who visit the house.
** Mortimer gets so involved in recounting a play to Dr. Einstein that he doesn't notice Jonathan sneaking up behind him.
* FamousNamedForeigner: Dr. [[http://en.wikipedia.org/wiki/Einstein Einstein]], although it's almost certainly an alias.
* FramingTheGuiltyParty: A classic example of this trope, used in at least three ways. Mortimer initially believes that Teddy is responsible for the body in the window seat, so he insists that he be sent to Happydale immediately so he [[InsanityDefense can't be imprisoned for the murder]]. Later, when Abbey and Martha insist on going with Teddy, Mortimer jumps at the chance to get them committed too, spinning their innocent confession as proof of their insanity. Meanwhile, he sets up Jonathan to be charged not only for the body he brought with him, but by implication his aunts' murders as well.
* FunnyBackgroundEvent: Teddy's reaction to Mortimer's attempt to persuade the police to commit his aunts.
* GenreBlindness: DiscussedTrope. When Dr. Einstein suggests Mortimer should be GenreSavvy enough to comprehend the danger he's in (Mortimer is a theater critc), he makes the mistake of remarking that characters in plays at least ''act'' intelligently. Mortimer then proceeds to explain the frequent use and abuse of the IdiotBall in plays, [[DramaticIrony fittingly unaware]] that he's holding it.
* GeorgeWashingtonSleptHere: Referenced in the film when one of the police officers asks if George Washington slept in the old house owned by the two old women.
* HamToHamCombat: Capra said that he let the scene-stealers run wild in the film.
** Cary Grant and Raymond Massey, with Grant playing the fearless hero and Massey menacing him back like a movie monster.
** Grant briefly does combat with Peter Lorre after Dr. Einstein gets frustrated with Mortimer. In his improv, Grant slips in a quip at Lorre's usual soft, quiet, decidedly non-ham style, saying, "Stop underplaying, I can't hear you!"
* HappilyAdopted: As much as he loves (most of) the Brewsters, it still comes as a great relief to Mortimer to find out he isn't a blood relative.
* IKnowYouKnowIKnow: Jonathan and Mortimer bluffing each other to leave.
* INeedAFreakingDrink:
--> '''Mortimer:''' No, I am ''not'' drunk, madam, but you've given me an idea!
** After getting off the phone, Mortimer sits down in exhaustion and reaches offhandedly for the wine carafe, only to have Abby and Martha warn him off. This has the side-effect of saving the life of another "Yellow Fever victim".
** Poor Dr. Einstein's alcoholism is a running gag throughout, and seems to have been a deliberate, clever device to heighten suspense whenever the elderberry wine is within reach. It's also partly responsible for Jonathan's ghastly appearance.
** In the film, Mortimer gets so desperate for a drink that he finishes Dr. Einstein's schnapps and sets up the elderberry wine fake-out himself. He even says the words, "Boy, could I use a drink."
* IdiotBall: In addition to Mortimer's GenreBlindness above, Officer O'Hara gets to hold it, especially after seeing Mortimer tied up upon his return to the Brewster house. Dr. Einstein tries to pass it off as something Mortimer was demonstrating as happening in a play (which is actually somewhat accurate), O'Hara refuses to untie Mortimer until he's had a chance to explain ''his'' play!
* InTheBlood: The hereditary madness of the Brewster family.
* IneffectualSympatheticVillain: Dr. Einstein. He's so pathetic that by the end [[KarmaHoudini nobody seems to mind him escaping]].
* InsaneEqualsViolent: Played straight with Abby, Martha and Jonathan. Averted with Teddy, who unwittingly abets the murders but is otherwise harmless.
* InsaneTrollLogic: Mortimer pulls this when trying to get Teddy to sign the papers to commit himself and his aunts to Happy Dale.
--> '''Mortimer:''' The name Brewster is code for Roosevelt.
--> '''Teddy:''' Code for Roosevelt?
--> '''Mortimer:''' Yes. Don't you see? Take the name Brewster, take away the B, and what have you got?
--> '''Teddy:''' Rooster!
--> '''Mortimer:''' Uh-huh. And what does a rooster do?
--> '''Teddy:''' Crows.
--> '''Mortimer:''' It crows. And where do you hunt in Africa?
--> '''Teddy:''' On the veldt!
--> '''Mortimer:''' There you are: crows - veldt!
--> '''Teddy:''' Ingenious! My compliments to the boys in the code department.
** The confused police inspector then remarks, "Do that again!"
* InsanityDefense: Used preemptively; Mortimer hopes that by getting his aunts committed to Happydale, they won't be sent to prison for murder if/when their crimes are eventually discovered.
* InsistentTerminology: Toward the end Witherspoon shows up and asks the disgruntled cab driver to drive him and Teddy back to Happy Dale:
--> '''Cab Driver:''' I knew this would end up in the nuthouse!
--> '''Witherspoon:''' We like to think of it as a ''rest home''.
* InterruptedIntimacy: Mainly just implied -- this is from TheForties, after all -- but it's their wedding night, and Elaine is clearly put out by Mortimer's continued lack of, er, ''availability''.
* ItRunsInTheFamily: Mortimer remarks: "Insanity runs in my family. It practically gallops!"
* ItWasHereISwear: A RunningGag with the body in the window seat.
* KarmaHoudini: Dr. Einstein sneaks out the door while the police are busy with Jonathan and the family is busy committing the Aunts. Or, at least, he tries to until Mortimer notices him. He asks Dr. Einstein to sign the committal papers for him, after which the good doctor leaves without further incident.
** In addition, the two aunts, who at the end of the play are all committed to Happy Dale, a fairly comfortable sanitarium, as opposed to being arrested or committed to a hospital for the criminally insane. The end of the play which is not shown in the film, however, shows that the aunts go back to their old habits with the warden which leaves open the possibility that they will be revealed.
* LampshadeHanging: A classic example. Mortimer, a theatre critic, complains about a character in a play being handed the IdiotBall, not realizing that he's describing himself.
--> '''Dr. Einstein''': You know, you were right about that fellow in the play. He wasn't very bright.
* MaidenAunt: Abby and Martha never married, but they seem to have raised both Jonathan and Mortimer.
* MediumAwareness: Teddy, in some productions.
* MinionWithAnFInEvil: Dr. Einstein's effort to get Mortimer the hell out of the house and spare him a grisly fate seems genuine. He's very sweet to Teddy and won't abide killing him when Jonathan threatens it, and when Jonathan tries to kill Officer O'Hara, the Doctor knocks him out before he can. He's also very courteous to Abby and Martha.
* MistakenConfession: Played straight, when Jonathan thinks the police have caught him, but they're really talking about O'Hara. Subverted, when the aunts innocently confess right in front of the police captain, forcing Mortimer to resort to a SarcasticConfession plus RefugeInAudacity to convince him that the tale is a product of their insanity.
* MistreatmentInducedBetrayal: A minor case; Dr. Einstein is so squeamish that he tries to convince Mortimer to leave rather than be tortured and killed by Jonathan, and he later helps the police capture him.
* MurderIsTheBestSolution: And it leaves them looking so "peaceful".
* NapoleonDelusion: Teddy thinks he's UsefulNotes/TheodoreRoosevelt. And the stairs are San Juan Hill. [[RunningGag CHAAAARGE!... *ding*]]. In the film adaptation, Dr. Witherspoon asks Mortimer if he could persuade Teddy to think he's Napoleon, as they already have quite a few Theodore Roosevelts at Happy Dale and another one would mean trouble amongst the patients.
* NeverOneMurder: Mortimer initially assumes that the first body he discovers was an accident or an isolated event, but then Abby and Martha reveal that they have been at their "charity" work for years.
* NoDoubtTheYearsHaveChangedMe: Mortimer does not initially recognize Jonathan due to the latter having undergone multiple plastic surgeries. Jonathan quotes the trope almost verbatim.
* NoodleIncident: Whatever the "UsefulNotes/{{Melbourne}} Method" involves. Local productions vary on its description, which is usually improvised by the cast members portraying Jonathan and Dr. Einstein.
* NotMyLuckyDay: For Mortimer, and it just keeps getting worse.
* ObliviouslyEvil: The sweet little old ladies genuinely have no idea that poisoning multiple people makes them {{Serial Killer}}s.
* OfficerOHara: There actually ''is'' an officer O'Hara in the film, though without the [[{{Oireland}} Oirish]] accent sported by his predecessor on the beat, Officer Brophy.
* OnlySaneMan: Mortimer, both metaphorically and literally, and even he begins to doubt it in the end.
* PoliceAreUseless:
** Thanks to FailedASpotCheck, the beat cops are utterly clueless about what's going on in the Brewster house. This is a good thing from Mortimer's point of view with respect to his aunts, but not so great with respect to Jonathan.
** In the movie, the police captain who finally recognizes Jonathan as a wanted man manages to listen and repeat a perfect description of his accomplice Dr. Einstein, who is right in front of him, without recognizing him.
** Officer O'Hara is a special example. He walks into a room with a man tied up and gagged... And all he can think about is how much it reminds him of the play he's writing. The spends the next eight hours explaining the plot. He doesn't finish the first act.
* ProperlyParanoid: Mortimer. Just not quite paranoid enough.
* PublicDomainSoundtrack: The aunts' {{Leitmotif}}, used extensively in the Music/MaxSteiner score, is "Happy Land," an 1850 hymn with words by Andrew Young and music arranged by Leonard T. Breedlove. (At least it wasn't ''AmazingFreakingGrace''.)
* QuickNip: Dr. Einstein carries a flask in his pocket. When it's emptied toward the end, he gets truly desperate, setting up the elderberry wine fake-out.
* RefugeInAudacity: It's amazing that they managed to get away with portraying murdering old ladies as sympathetic in UsefulNotes/TheHaysCode-era Hollywood. Also see Mortimer's use of this in SarcasticConfession.
* RegionalRiff:
** The Music/MaxSteiner score sets the scene with a StandardSnippet of "The Sidewalks of New York" -- suitably rendered in the minor.
** Also when the Asian woman winks at Elaine at the marriage office, a slight [[https://en.wikipedia.org/wiki/Oriental_riff Oriental Riff]] occurs.
* RepeatingSoTheAudienceCanHear: The police captain's conversation with his precinct, during which he repeats Dr. Einstein's WantedPoster description word for word so the audience can see Einstein's increasingly panicked reaction.
* RunningGag: Let's see, there's Teddy's bugle playing (and charging), the constantly disappearing and reappearing body in the window seat, Elaine misunderstanding Mortimer's behavior, the cabby and his ever-escalating fare, Dr. Einstein's drinking, everyone trying to get Mortimer to review their plays, the obliviousness of the police, who's "going to Happydale"...
* SarcasticConfession:
-->'''Mortimer''': ''Certainly'' there are thirteen bodies buried in the cellar. And I've got ''hundreds more'' up in the attic, Captain!
* SerialKiller: Abby and Martha. Jonathan might or might not be one--it's uncertain whether his 13 murder victims were merely a byproduct of a life of crime or true Serial Killer murder-for-murder's-sake. The fact that he sometimes tortures them, as he apparently did in Melbourne and prepares to do with Mortimer, hints towards true Serial Killer.
* ShutUpKiss: Three times in a row! Some women just won't stop talking!
* SuckinessIsPainful: Mortimer, while BoundAndGagged, is forced to spend hours listening to Officer O'Hara describe the (horrible) play he wants to write.
* SuddenlySuitableSuitor: ZigZagged. Elaine is dizzy in love with Mortimer, but gets increasingly frustrated and angry with him when he seems to be brushing off their honeymoon, then is completely freaked out upon discovering the murders, and then finally folds in Mortimer's arms when he starts paying attention to her again.
* SugaryMalice: This movie is based upon the notion that a certain pair of sweet old ladies are inviting gentlemen over to drink homemade wine and then poisoning them.
* SympatheticMurderer: The aunts. Emphatically ''not'' Jonathan, though.
* TapOnTheHead: {{Lampshaded}}. Mortimer tells the cops not to bother as it never works, and is surprised when it does.
* TextualCelebrityResemblance:
** Forms Jonathan's BerserkButton. "He [[CoincidentalAccidentalDisguise looks like Boris Karloff!]]" In the Broadway production of the play, Jonathan was [[CastingGag actually played by]] Creator/BorisKarloff - in fact, the reason he wasn't in the film is that the play's producers had him under exclusive contract at the time.
** There was another run of the play that had Creator/BelaLugosi as Jonathan. For that one the line was changed to, '"Everyone tells me I look like Bela Lugosi!"
* ThatPoorCat: During the scene where Teddy's moving the "Yellow Fever victim" to the "canal", he apparently steps on a cat's tail. The cat is seen in an earlier scene coming out of the cellar.
* TooDumbToLive: Mortimer, {{Lampshaded}} by Mortimer himself:
--> '''Mortimer:''' ...Now, he knows he's in the house with murderers, so he ought to know he's in danger. He's even been warned to get out of the house. And does he go?\\
'''Dr. Einstein:''' Yes?\\
'''Mortimer:''' No, he doesn't, he stays. This fellow doesn't even have sense enough to be scared.
* TortureTechnician: Dr. Einstein carries a set of precision surgical instruments with him. He uses it for plastic surgery. Jonathan uses it for... other things.
-->'''Dr. Einstein''': Not the Melbourne method! [shudders] Two hours! And when it was over, what? The fellow in Melbourne was just as dead as the fellow in UsefulNotes/{{London}}!
* TrailersAlwaysSpoil: {{Subverted}}. A piece of promotional art spoils the original play's ending by showing [[http://us.imdb.com/media/rm305305856/tt0036613 Mr. Witherspoon about to take a sip of the poisoned wine as offered by Abby and Martha]]. However, this ending was never filmed, as Edward Everett Horton was deemed too popular an actor to kill off.
* WantedPoster: Apparently, Jonathan and Dr. Einstein feature prominently on one of these at the police station, [[FailedASpotCheck not that anyone but the captain notices]].
* WhiteSheep: Mortimer. Justified at the end when Abbey and Martha reveal that he was adopted.
* WrongGenreSavvy: Played for laughs -- Mortimer is an expert in theater tropes and [[DiscussedTrope continually comments]] on how things would turn out if he were actually in a play and trapped in a house with murderers... happily ignoring the fact that that's exactly what's going on.