Jennifer's Body is an 2009 Comedy Horror film written by Diablo Cody, the writer of Juno, and starring Megan Fox and Amanda Seyfried. The titular Jennifer is a high school cheerleader who goes to a rock concert, where the band tries to sacrifice her to Satan in order to get a record deal. It works, but Jennifer gets possessed by a demon in the process, causing her to start seducing, killing, and eating the boys in her school. Upon finding out, Needy, Jennifer's "plain jane" best friend since childhood, sets out to stop her from wiping out the student body.The name of the film is taken from the song "Jennifer's Body" by Hole.
Bait-and-Switch Lesbians: The earliest trailers showed Jennifer and Needy in intimate situations and despite their making out in the movie, both of them have male romantic/sexual interests. However, there is enough Les Yay in the movie for someone to reasonably assume that the two girls were at least bi-sexual. The argument could even be made for Jennifer being an outright lesbian, since all of her male interests were either the result of jockeying for social position, or trying to keep Needy for herself.
Billing Displacement: Perhaps one of the most extreme example ever. Amanda Seyfried, who is the film's protagonist and appears onscreen at least as often as Megan Fox, is scarcely mentioned in many reviews, which (whether approving or disapproving) wish only to talk about Fox and Diablo Cody.
Cassandra Truth: Chip initially doesn't believe Needy's seemingly outrageous claims about Jennifer, not that you can blame him. Also, Needy is the only one who knows that Low Shoulder aren't the heroes everyone else thinks they are; no-one else believes her when she states otherwise, presumably because that's part of Low Shoulder's deal with the devil.
The whirlpool beneath the falls. In Act I, Needy says that no one knows where it empties out at. In Act III, she finds out, finding Chekhov's Gun number 3:
The knife that Jennifer was sacrificed with.
The Cheerleader: Vapid, skanky and bullying... and that's before she gets possessed.
Contagious Powers: Being bitten by a demon and surviving gives you some of its power.
Cursed with Awesome: Jennifer believes that her possession is essentially this (in a deleted scene, she is openly amused when Needy speculates about a possible cure for Jennifer's curse). Needy herself becomes Cursed with Awesome at the end of the movie.
Dawson Casting: 23-year-olds Megan Fox and Amanda Seyfried, and 22-year-old Johnny Simmons.
Death by Sex: Played so straight it's likely a parody of this trope - Jennifer uses the promise of sex to lure boys into places where she can eat them.
Jennifer: It smells like Thai food in here. Have you guys been fucking?
Downer Ending: Some of the main cast are killed (Jennifer and Chip), and Needy gets put in an insane asylum. On the plus side, Karma Houdini was averted since Needy gained some of Jennifer's powers (super strength and levitation, at the least) and proceeded to escape and murder all of Low Shoulder.
Fan Disservice: Yes, it is Megan Fox, but it is somewhat difficult to find Jennifer sexy when she's covered in blood, has a mouthful of sharp piranha teeth and is acting creepy as hell.
Finger Suck Healing: In a flashback, Needy did this for Jennifer when they were children. It is implied that this is why Needy is able to sense when Jennifer is about to kill someone.
Giggling Villain: Jennifer indulges in some very creepy giggling shortly after her possession.
Girl on Girl Is Hot: Is there any other reason why this film has a minute-long scene of Megan Fox and Amanda Seyfried making out?
A God Am I: After realizing her newfound healing ability, Jennifer burns her tongue with a lighter then loudly declares "I am a God."
Amanda Seyfried as the "plain jane" Needy. The narration outright states that, when they go out, Needy dresses herself down so as to not steal any of the spotlight from Jennifer, and is specificaly forbidden from showing any cleavage, since Needy's is more substantial than Jennifer's. This means that, in-universe, the characters are entirely (if tacitly) aware of Needy's actual hotness.
Also Jennifer. If she doesn't feed on schedule, she starts getting ugly... meaning "still Megan Fox but with heaps of makeup to give her shadows and sallow skin." Very likely intentional, as Needy describes this as being "ugly for her", to show how high Jennifer's standards are.
Hollywood Hype Machine: From the marketing, to even the movie poster at the top of the page, this movie was pretty much an attempt to cash in on Megan Fox's status as an "It Girl." It backfired.
I Have Boobs, You Must Obey!: Jennifer uses this to get drinks, despite being underage. She explicitly calls Needy's tits "smart bombs" for their destructive power.
Impaled with Extreme Prejudice: Chip impales Jennifer with a large pole just before he dies. It doesn't kill her, but, hey, at least he tried.
Indecisive Parody: One common criticism of the movie is the fact that it flops back and forth between being intentionally silly and seeming to take itself seriously.
Intentionally Awkward Title: Just try saying "Jennifer's Body" in a casual conversation without adding the words "the movie" before it. See what happens.
Jabba Table Manners: Jennifer, when she tries to eat the chicken from Needy's fridge.
Jerkass: Jennifer starts out as one, but she becomes a lot crueller after her possession. Also Nikolai.
Jump Scare: Used a few times, most notably when Jennifer is standing right behind Needy shortly after her murder and possession, and then later in the same scene when she suddenly lets out a demonic roar. Also used when a bird frightens Colin when he is trying to find Jennifer in the partially-constructed house.
Karma Houdini: Played straight with the Low Shoulder band, who get away with casually sacrificing a non-demonic Jennifer for fame and fortune (as well as being behind the fire that killed everyone at the bar in order to lure a drunk Jennifer outside for kidnapping)... and then gloriously averted at the end; Needy, who has gained Jennifer's powers, escapes the mental institution. Her first goal? Making her way to Low Shoulder's hotel and butchering them all. Bonus points go to the murder of Nikolai, the lead singer and the mastermind behind the whole plan, who gets a knife to the gut the same way he killed Jennifer.
Kick the Dog: Jennifer loves doing this, particularly after her possession.
I dreamed some bad people were trying to nail you to a tree with hammers and big stakes and shit. Just like J.C. But I didn't let 'em get to you, 'cause I'm a hard-assed, Ford-tough mama bear.
Manly Tears: Jonas, after his best friend dies in the fire.
The town too. Of course a demonic sacrifice would happen in a town called "Devil's Lake Kettle".
Mood Whiplash: Intentionally invoked in the scene that jumps between Jennifer seducing, then devouring some poor schmuck and Needy and Chip's WAFFy sex.
Ninja Pirate Robot Zombie: Chip invokes this when he says this about Jonas' mother: "She's staring out the window like a zombie mannequin robot statue."
Nothing Is Scarier: Used to great effect shortly before Needy discovers Jennifer in her house.
Obviously Evil: Nikolai, Low Shoulder's lead singer, is this in Needy's eyes.
I watched her get into that van and I knew something awful was going to happen. He was skinny and twisted and evil like this petrified tree I saw when I was a kid.
The Power of Friendship: Jennifer loses her ability to levitate when Needy rips off her BFF necklace.
Psychic Link: It is strongly implied that Jennifer and Needy have one, following an incident when they were children in which Needy sucked the blood from a puncture on Jennifer's hand.
Reality Is Unrealistic: The Devil's Kettle is a real waterfall. Half the river really does disappear into the ground. Scientists have no idea where it comes back out. (The town in the movie doesn't exist.)
Roaring Rampage of Revenge: After discovering that she has gained some of the demon's powers, Needy uses them to escape the mental institution, so she can track down and murder all of Low Shoulder.
Rock Me, Asmodeus!: Low Shoulder, the indie band that tries to sacrifice Jennifer in order to get a record deal.
Rule of Pool: Just before Jennifer eats Chip, Needy's boyfriend, she tosses him into a pool while he is wearing formal wear. She then proceeds to jump in after him. Followed soon by Needy.
Scenery Porn: The scene where Jennifer is swimming naked in a lake. The first shot of the scene is actually a wide-angle overhead shot with Jennifer's body only a tiny speck—she's actually quite easy to miss, so for that shot at least the lake is the emphasis.
Sex, Drugs, & Rock and Roll: Low Shoulder is living this lifestyle when we see them on tour at the end of the movie.
Sex Sells: Just watch the film's ad campaign. Heck, the film's title is named after it.
Sir Not-Appearing-in-This-Trailer: Amanda Seyfried does appear in the trailers, but apart from her name on top, she is absent from all the posters, which focus exclusively on Megan Fox.
Slasher Smile: Jennifer displays one at various times. Most notably after she first becomes possessed and when she appears in Needy's vision sitting on top of the chair watching her and Chip have sex.
Sliding Scale of Comedy and Horror: Slides all around this. Scenes go from funny to shocking to funny, then back to shocking. Usually with quite a bit of sexy in the middle.
Soundtrack Dissonance: Tracks like Panic! at the Disco's "New Perspective" and Florence and the Machine's "A Kiss with a Fist" seem a bit light for a horror movie.
Not to mention an in-movie example when Low Shoulder sings Tommy Tutone's '867-5309/Jenny' as they murder her.
Super Strength: Jennifer gains this power following her possession, enabling her to seriously overpower Jonas, who is described as "the biggest guy in school". She also throws Colin around like a rag doll. Needy also appears to gain this power after being bitten by Jennifer.
Touched by Vorlons: Needy gains some of Jennifer's demon powers after being bitten by her. She uses them to break out of the mental hospital and kill Low Shoulder.
Virgin Sacrifice: Low Shoulder tries to sacrifice Jennifer, thinking she's a virgin. Unfortunately, she's been having sex sincejunior high. The ritual works as planned, but Jennifer gets possessed by a demon because she wasn't a virgin.