History Film / TheGirlOnTheThirdFloor

* StuffedIntoTheFridge: Stuffed into the walls. And the dryer. Don finds [[spoiler: his slain dog in the dryer, and later finds Milo's head within the walls when breaking one down.]] The first victim he finds by accident, the second is placed intentionally for him to find. Sarah later texts Don from [[spoiler: Milo's]] phone, with an attached image reading "actions have consequences".

* WomenAreWiser: Don falls to the ghost's temptations and is drawn in deeper by the house. Liz proves that she is not so easily manipulated and circumvents the attacks on her at every turn due to her control over her vices. Ellie, who bears a good deal of knowledge about what the house is like and its history, is shown to use that knowledge to try to push both occupants away from succumbing to the House.
* YourCheatingHeart:
** How Sarah gets to Don. It's apparently been a problem in his and Liz' marriage.
** It can be inferred that Milo has feelings for Liz, Don's wife, as the word "friend" is noticeably a bit forced when he describes her, and [[spoiler:the House goes for one final attack on her by calling her with Milo's head, stuffed into the wall, directly before the Nymph comes out.]] It never goes beyond inferences, though.

* DarkAndTroubledPast: Sarah, the ghost haunting the house. [[spoiler: She grew up sexually abused, to be used as part of an illegal brothel's nightly show, from what is implied to be a very young age. Eventually, the owner simply murdered her, throwing her body onto a train's tracks, and no one ever even went looking into her disappearance.]]
* TheDividual: Sarah talks to the Nymph, and judging by the hints and later exposition of her past, the two of them may be two apparitions of the same person at different time periods.

The movie contains examples of:

* SpoiledByTheFormat: [[spoiler: Don gets eaten late into the movie, but there's still 20-30 minutes left, making it clear Liz will have it out with Sarah and the house.]]

* NauseaFuel: The house has a nasty habit of producing strange, seemingly organic fluids... including a strange white slime in several scenes that is very, very clearly supposed to be semen. There's also the scene in which Don opens a wall to reveal [[spoiler: pulsating red viscera.]]

* VaginaDentata: [[spoiler: The face of The Nymph-- particularly, her long sideways mouth studded with prominent teeth--]] seems to be invoking this.

* EvilIsPetty: The House will target any positive influences on its chosen victims who get within its walls, even if they're not hostile. This includes [[spoiler: Milo and Trooper, Don's close friend and dog, respectively.]] The latter, it does purely because the occupant pissed it off.

* AssholeVictim: Don Koch is a truly miserable excuse for a husband, happily cheating on his wife, who is ''heavily pregnant with his child'', mere days after being out of her sight, and instead of being the least bit guilty about it, he insists to his dog that he ''earned'' it, lies about it to his best friend, and only attempts to rebuff the side chick when her presence threatens the secrecy of the affair. He's also horrible in general, having a drinking problem and anger issues, and having defrauded his clients out of tons of money when he was a lawyer. However, even being all that he is, ''no one'' deserves to find [[spoiler:their beloved pet in pieces inside a dryer like a sick prank and their best friend's corpse hidden in the walls of their home.]] He's a poor excuse for a person, but a highly pitiable one at that.

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* ArtifactOfDoom: Something bad happening is always heralded by a marble rolling downstairs from the first floor. When Don finally agitates the house beyond its patience, the Nymph wakes up. When she comes after him, the first marble [[spoiler: invades his body through a foot wound he got earlier, crawling under his skin. He tries to cut it out with a knife, leading him to sever his own jugular when it proceeds up his neck.]] Several marbles drop down from her hands afterward, and it's implied they're involved in the [[spoiler:assimilation process.]]

* OurGhostsAreDifferent: Sarah and the Nymph. Sarah has powers of OffscreenTeleportation, [[TheVamp seduces the protagonist to cheat with her]], and has intimate knowledge of the House, but she can be dispatched physically. However, she doesn't stay dead long. The Nymph seems to be the true "core". She stays out of sight most of the time but comes out to "feed" when victims can't fight back--but she is highly vulnerable to physical damage and can be slain for a time, and doing so halts Sarah's attacks.

* EvilIsPetty: The House will target any positive influences on its chosen victims who get within its walls, even if they're not hostile. This includes [[spoiler: Milo and Trooper, Don's close friend and dog, respectively.]]

* OurGhostsAreDifferent: Sarah and the Nymph. Sarah has powers of OffscreenTeleportation, [[TheVamp seduces the protagonist to cheat with her]], and has intimate knowledge of the House, but she can be dispatched physically. However, she doesn't stay dead long. The Nymph seems to be the true "core". She stays out of sight most of the time but comes out to "feed" when victims can't fight back--but she is highly vulnerable to physical damage and can be slain.

* YourCheatingHeart: How Sarah gets to Don. It's apparently been a problem in his and Liz' marriage.

* DoNotTauntCthulu: Don is in danger from the first moment he steps into the house, but it starts reacting quite agitatedly when he starts beating the walls in with a hammer in a rage. This eventually wakes the Nymph up, and it goes downhill from there.