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''Duplex'' is a 2003 BlackComedy film directed by Creator/DannyDeVito, starring Creator/BenStiller and Creator/DrewBarrymore.

It features a young couple, Alex (Stiller) and Nancy (Barrymore), who move into a brownstone duplex in Brooklyn, where an elderly tenant named Mrs. Connelly (Eileen Essell) starts giving them hell. She sends both of them on a myriad of errands, keeps them up all night (every night), gets them fired from their jobs, and lowers the value of the property with each passing day.

Since they can't get rid of the sweet old lady because of [[FriendsRentControl rent control]], Alex and Nancy try to coerce her out of the apartment, eventually turning to less friendly methods... and getting clumsier and clumsier the more they escalate.

!!This film provides examples of:
* BadCopIncompetentCop: You start with Officer Dan who you think is just a [[PoliceBrutality unnecessarily violent]] JerkAss, but later you find it out it's [[spoiler:[[DirtyCop intentional]] to scare Alex and Nancy into leaving]].
%% * BitchInSheepsClothing: Mrs. Connely.
%% * ButtMonkey: Alex. Well, he IS played by Creator/BenStiller.
* CoolOldLady: Mrs. Connelly is an Irish seaman's widow with a parrot and a spear gun.
%% * CringeComedy: Happens often in the first half of the movie, and a bit later as well.
%% * HarmlessElectrocution: Barrymore's character, Nancy.
* IShouldWriteABookAboutThis: The main character is trying and failing to write a book throughout the movie, mostly due to his upstairs tenant. The end of the movie shows his published novel, also titled ''Duplex'', presumably about the events he experienced during the movie.
* MarketBasedTitle: The UK title is "Our House".
%% * MostWritersAreWriters: Alex is a writer.
* {{Narrator}}: Creator/DannyDeVito, who also directed the movie, is narrating it.
%% * {{Oireland}}: Mrs Connelly complete with bad Irish accent and yes, there are stereotypes which'll make Irish people vomit.
* OneWordTitle: In combination with ThePlace, one of its known titles is ''Duplex'', about the duplex the characters live in.
* ThePlace: In combination with OneWordTitle, one of its known titles is ''Duplex'', about the duplex the characters live in, and the UK title is ''Our House'', which is an example of this trope.
%% * ProfessionalKiller: Chick the hitman, who has a legitimate job as a pornographer.
* TheReveal: [[spoiler:Mrs. Connelly is discovered to be both alive and in fact she is the mother of Kenneth, the Duplex real estate agent, and in fact it's a RealEstateScam to make them sell the house cheaper then they bought it]].
%% * SpiritualSuccessor: Often said to be so to Danny [=DeVito's=] own ''Film/ThrowMommaFromTheTrain''.