[[quoteright:349:http://static.tvtropes.org/pmwiki/pub/images/SummerTrilogy_4509.jpg]]
[[caption-width-right:349:Some people ''really'' don't know how to let things go...]]

->''"If you're going to bury the truth, make sure it stays buried."''

''I Know What You Did Last Summer'' (1997) is a horror/slasher film very loosely based on [[Literature/IKnowWhatYouDidLastSummer the novel of the same name]] by Creator/LoisDuncan, starring Creator/FreddiePrinzeJr, Creator/SarahMichelleGellar, Creator/JenniferLoveHewitt, and Creator/RyanPhillippe. The screenplay was written by Kevin Williamson, one of the writers of ''Film/{{Scream 1996}}''.

The tale starts with a party and the consumption of too much alcohol, as these stories tend to do, during a beach party after Helen Shivers (Gellar) wins the Croaker County Beauty Pageant. On the way home, however, a drunken swerve of the friends' car leads to the death of a fisherman on the side of the road. The four decide to tell no one, and to forget the whole thing, throwing the body into the ocean. But somebody saw, and the next summer, they start to take vengeance, warning the four with an ominous message: ''[[TitleDrop I KNOW WHAT YOU DID LAST SUMMER]]''. Before long, people start dying, killed by a rain-slicker-clad figure wielding a hook...

''I Know What You Did Last Summer'' was followed by two sequels: ''I Still Know What You Did Last Summer'' (1998) and the straight-to-video ''I'll Always Know What You Did Last Summer'' (2006). For tropes applying to the original novel, see [[Literature/IKnowWhatYouDidLastSummer its own page]].

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[[folder:''I Know What You Did Last Summer'' (1997)]]
!!This movie contains examples of:
* AdaptationDyeJob: Julie is a redhead in the book, and brunette in the film.
* AdaptationExplanationExtrication: A minor example. Elsa in the book is an overweight bitter girl who's jealous of Helen's beauty and easy success - she has to work long hours and still lives at home, while Helen gets a cushy job as a weather girl and is able to afford a nice apartment. In the movie Elsa is just as beautiful, and Helen has a failed attempt at becoming an actress and gets reduced to working in the family department store. So Elsa's jealousy and dislike of Helen isn't really explained.
* AdaptationalAttractiveness:
** Elsa, Helen's sister, is described as very unattractive throughout the book. In the movie, she's just as pretty as Helen is. Elsa was written as plain looking in the script; the director decided that if Helen is gorgeous, Elsa should be too.
** Julie has a moment in the book where she notices her mother going grey-haired, and her hands looking very old. None of this is shown in the film, and her mother looks quite youthful.
* AdaptationalBadass: In the book, Julie is knocked out while Ray fights the killer offscreen. In the film, she helps him fight the killer.
* AssholeVictim: The fine details are up for debate, but this is a slasher film that actually attempts to justify all the various teenagers getting killed; a hit-and-run probably doesn't deserve a RoaringRampageOfRevenge, but it's not the usual innocent batch of campers either. [[spoiler: It's then revealed that the man they hit had just committed a murder himself, and didn't die when they dumped the body in the sea]].
* AudibleSharpness: The hook in the both movies. Even when it contacts nothing but air.
* BadassLongcoat: The fisherman's raincoat.
* BeautyContest: Helen wins one at the start of the film.
* BeautyIsNeverTarnished: A justified example. The killer cuts off some of Helen's hair while she's asleep, but she reappears for the pageant with it all tidied up. Naturally the killer wouldn't want to give her a reason to miss the parade.
* BigBad: The Fisherman, [[spoiler:aka Ben Willis.]]
* BigBrotherBully: Gender Flipped but Elsa spends most of her screen time mocking or belittling Helen.
* BlackBestFriend: Julie has a sassy black roommate in college called Deb in the first film. In the second, her also black best friend Karla is a main character.
* BlackSpot: Julie receives a note saying "I know what you did last summer". [[spoiler: A similar note being found in David Egan's belongings tips her off that he wasn't the man they hit]].
* CantGetAwayWithNuthin: [[spoiler: Barry and Helen]] are the ones who dump the body in the river, and they're the ones who die.
* CondensationClue: Or possibly Cendensation Sequel Hook: the writing on the fogged-up shower stall glass at the end of the film, Foreshadowing the second film's title.
* DarkSecret: The hit and run that starts the plot.
* DisposingOfABody: The characters did it last summer.
* ExpositoryHairstyleChange: Julie has curly hair in the intro, but it is unkempt after the accident. Notably in the finale segment, it's curly once again.
* FallenPrincess: Helen appears to be such. She's implied to be a popular girl at school, and wins the local beauty pageant at the start. There's also cheerleading memorabilia in her room. But her plans to make it as an actress in New York fail, she and Barry split up and she's reduced to working in a department store.
* FanService:
** Jennifer Love Hewitt in that tank top she wears for the final third of the first film. And her wiggling around in the tanning bed in the sequel.
** Sarah Michelle Gellar also walks around wearing hot pants in the second act.
** Ryan Phillippe gets a gratuitous ShirtlessScene at the gym.
* FinalGirl: Julie, who's a far more of an obvious Final Girl compared to her book self - she gets an AdaptationDyeJob to become brunette, is said to be an excellent student, and takes the moral high ground.
* FromNobodyToNightmare: The Fisherman. [[spoiler: A seemingly normal local man, he became a serial killer after the loss of his daughter]].
* GenreSavvy: When the girls go to visit the family of the man they killed, Helen says "[[Film/TheSilenceOfTheLambs Jodie Foster tried this and a serial killer answered the door.]]"
* TheGloriousWarOfSisterlyRivalry: Helen and Elsa, far more so than in the book. Elsa is more obviously the smart sister - in a prominent position at the family department store, more business savvy and [[SmartPeopleWearGlasses she wears glasses]]. Helen is the pretty sister naturally.
* HooksAndCrooks: The killer carries a gaffing hook.
* HorrorDoesntSettleForSimpleTuesday: All three films take place around the Fourth of July.
* InNameOnly: The original book and the film share only character names and a hit-and-run that sets the plot in motion. Everything else is night-and-day -- the Duncan novel is a mystery/drama [[spoiler:in which none of the main characters die]], while the film is a slasher.
* {{Irony}}: When dumping the body, Barry says to pretend he's a serial killer and they're doing everyone a favour. [[spoiler: It turns out he's ''right'']].
* ItWasHereISwear: Used repeatedly (and relentlessly). The most egregious example is the dead body and 400 crabs stowed in the trunk of one character, only to disappear equally suddenly. Not only does the body and crabs disappear within minutes, but the trunk's carpet is also pristine clean.
* JerkJock: Barry, but more so in the book. He was a football player and goes to college on scholarship. In the movie he's only shown at the gym once.
* MistakenForMurderer: Julie [[spoiler:wrongly accuses Barry of having been the murderer all along.]]
* NotQuiteDead: The Fisherman shows signs of movement right before they dump the body. [[spoiler: It turns out he lived after all]].
* OffScreenTeleportation: Max's body vanishes from the trunk of Julie's car. Although given that she ran the rest of the way to Helen's house, had to explain what happened to the other two and then walk back - it does give the killer ''some'' time to move it if he was following Julie from her house. And if Helen's house is further away than we assume from when Julie gets out of the car. [[spoiler: The killer however inexplicably appears out of nowhere to kill Helen when she escapes from the department store]].
* PeekabooCorpse: [[spoiler: Helen and Barry on ice.]]
* PickOnSomeoneYourOwnSize: Intergender example; the crazed fisherman is obsessed with killing Julie James and friends after [[spoiler:they hit him with their car. He got better.]]
* PoliceAreUseless: The inept cop in the first job who dismisses Helen as a hysteric [[spoiler: and ends up getting hooked himself.]]
* TheReveal: [[spoiler: The killer is Ben Willis (the guy the group actually hit) and not David Egan (who they thought they hit, and who Ben actually killed) or someone trying to avenge him.]]
%%* RevengeBeforeReason: The Fisherman.
* RoaringRampageOfRevenge: The Fisherman after he's left for dead.
* RuleOfSymbolism: The accident and cover-up symbolise the loss of innocence from childhood to adulthood. The protagonists are teenagers graduating from high school, and the plot takes place after they've spent a year trying to live as adults. Helen notably has become a FallenPrincess, Julie was once a straight-A student whose grades are slipping, and Barry was once the BigManOnCampus that ends up in hospital. The characters lamenting how they can't go back to how their lives were before the accident parallels how they can't become innocent again.
* SacrificialLamb: Max, whose death was added in re-shoots, after filmmakers realised they needed to show that the killer posed a threat.
* SassyBlackWoman: Julie's college roommate Deb.
* StrangerBehindTheMask: [[spoiler:The twist is that David Egan is in fact ''not'' the man the teens hit with the car. It's actually the man who murdered him - though this is foreshadowed earlier in the film]].
* TimeSkip: ''"One year later..."''
* TraumaticHaircut: The killer cuts off some of Helen's hair while she's asleep.
* VillainBall: The Fisherman sure does pass up a lot of opportunities to kill those teens. Somewhat justified, as his intent is not only to kill them, but to make them squirm and be afraid. Still, [[spoiler:Willis' quest for revenge threatens to expose his murder of David Egan, which he would've been clear of completely thanks to the teens]]. The second movie is arguably worse, where the Fisherman should know better by then not to mess around.

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[[folder:''I Still Know What You Did Last Summer'' (1998)]]
!!This sequel has examples of:

* BehindTheBlack: Why [[spoiler: Ben doesn't see Julie waking up, picking up Ray's revolver from the ground and preparing to shoot him throughout the finale. Could be sort of justified, though, since Ben has just killed his son accidentally, so Julie waking up was probably the least of his concerns.]]
* BigBad: The Fisherman.
* BottomlessMagazines: Julie shoots the Fisherman eight times. With a six-shooter.
* TheCapitalOfBrazilIsBuenosAires: Lampshaded and subverted in the movie as a plot point.
* ComplexityAddiction: Instead of simply rehashing the events of the previous film, The Fisherman [[spoiler:has his create a fake radio contest just to lure the kids to a remote island]].
* CousinOliver: [[spoiler:Will is the previously unmentioned son of Ben Willis]].
* GambitRoulette: The Fisherman's plan involves sending Julie to an island resort full of people and ensuring that she would [[spoiler:become friends with his son and win the "contest" to get the trip.]]
* HookHand: The killer in the sequel has one of these.
%%* MurderByMistake
%%* NastyParty
* PunctuatedForEmphasis:
-->'''Julie''': Just *Gunshot* Fucking *Gunshot* Die!
* PunnyName: Will Benson, [[spoiler:who is the son of the previous killer, Ben Willis]]. It's even lampshaded.
* RadioContest: Julie wins the trip from one. [[spoiler:It is eventually as a hoax set up by Will Benson]].
* TheReveal: [[spoiler: Will Benson is ([[PunnyName obviously]]) Ben Willis' son.]]
* SpicyLatina: Nancy is this merged with AloofDarkHairedGirl.
* TheStinger: Someone is still trying to kill Julie at the end of the film. [[spoiler:According to the next film, it's the Fisherman himself. After Julie killed him, he came back as a ghostly entity that looks like a zombie]].
* TokenMinorityCouple: There's Julie and Ray (white), and Julie is also involved with Will (white). Karla and Tyrell are the BetaCouple, and they're both black.
* VillainBall: The Fisherman is worse about messing around with the teens instead of outright killing them, considering that he should know better by now and not to mess around.

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[[folder:''I'll Always Know What You Did Last Summer'' (2006)]]
!!This sequel has examples of:

* AgonyOfTheFeet: The Fisherman attacks Colby by impaling his foot with his hook while Colby's doing swimming laps. He has to get by the rest of the film with crutches.
* ArtifactTitle: The title still refers to "last summer" of the first film, even though those events were multiple summers ago.
* BigBad: The Fisherman, [[spoiler:the one we've all met before, who's now an undead entity]].
* ContinuityNod: Amber reveals to Lance that she and her friends got the idea for the Fisherman prank from news clippings about the events of two previous movies.
* DarkSecret: P.J.'s death being a prank gone wrong for Amber and her friend. [[spoiler:The Fisherman's motivation has also been changed to return haunt any group of teens who have one]].
* DeadlyPrank: Amber and her friends arrange a prank which makes it seem that the Fisherman is attacking them in a carnival, which is supposed to lead to P.J. performing a sick skateboard trick on front of everyone. It fails when P.J. plummets to his death instead.
* EvilMakesYouMonstrous: [[spoiler:Ben Willis, aka The Fisherman, was originally a revenge-driven killer who used a hook as his WeaponOfChoice. By this film, he's apparently become an undead ghost/living memory still driven to kill]].
%%* FinalGirl: Amber
* HooksAndCrooks: The Fisherman uses a gaffing hook once again.
* HorrorDoesntSettleForSimpleTuesday: A deadly secret causes problems once again on 4th of July
* ImmuneToBullets: The Fisherman is shot several times (and stabbed once), which just slows him down a bit. [[spoiler:Justified because he's one of the undead now]].
* ImpaledWithExtremePrejudice: Instead of landing on a pile of mattresses like he and his friends planned him to, P.J. ends up falling on a tractor pipe, which impales him.
* InterruptedSuicide: Just as Roger is about to slice his wrists open due to the guilt of getting P.J. killed, The Fisherman lures him into being chased and kills him.
* InNameOnly: The film is this to the first two, as besides [[spoiler:lacking any of the other characters besides the Fisherman]], it [[GenreShift shifts into]] [[spoiler:outright supernatural horror]].
%%* NightmareSequence
* OurGhostsAreDifferent: [[spoiler:The Fisherman is some sort of zombie ghost, possibly some kind of LivingMemory]].
* PreMortemOneLiner: Done when Amber [[spoiler:pushes The Fisherman into the spinning blades of a thresher]].
-->'''Amber''': The secret. Dies. With YOU!
* RedEyesTakeWarning: The Fisherman's eyes are showing flashing red twice after TheReveal.
* TheReveal: [[spoiler: The Fisherman is not a copycat, it's Ben Willis himself, who has literally come back from the dead this time.]]
* SlashedThroat: Roger is attacked by the Fisherman, and despite his best efforts to fight back, ends up getting his throat cut open. When his body is discovered, it's mistaken for suicide due to his the [[GoodbyeCruelWorld note he wrote]] moments before his death, since he was about to perform one.

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