->''"Did you know that a young boy drowned? The year before those two others were killed?"''

The first film in the ''Franchise/FridayThe13th'' series, and the TropeCodifier for SlasherMovie genre. Released in 1980.

Camp Crystal Lake has fallen on hard times. After several deaths in the late fifties and the sabotage of two other reopening attempts, the children's camp has remained an abandoned relic of the past. Steve Christy, the son of the camp's previous owners, plans another reopening and works hard to realize it. On the 13th of June, two weeks before the opening, the counselors Steve hired to run the camp arrive to help him.

But someone else shows up as well -- someone with murderous intent...
!!''Friday the 13th'' contains examples of the following tropes:

* AbortedArc: It seemed that there was a relationship of some sort between Alice and Steve, but none of this is explained further.
%%* AxeBeforeEntering
* AnAxeToGrind: Marcie is killed with an axe.
* BadSamaritan: Someone nice picks up Annie as she tries to hitch a ride. Then, MURDER.
* BathroomStallGraffiti: Marcie criticizes one when she goes to relieve herself.
* BatterUp: Alice briefly grabs a baseball bat to feel more secure in her cabin.
* BigNo: Claudette's last words.
* CatapultNightmare: Alice has one before the ending.
* TheCavalryArrivesLate: We don't see the police until well after the climax is over and daylight has broken out.
* CluelessMystery: A lot of the film feels like we're supposed to be trying to figure out who the killer is...and then it's someone who was never mentioned before. Though funnily enough, these days it does feel like a twist that [[spoiler:Jason isn't the killer.]]
* CoversAlwaysLie: One version of the DVD cover for the first movie has a holographic image revealing Jason's mask. [[spoiler:Not only is Jason not the killer of this movie, but he doesn't even show up (except for a short dream sequence)]]. Not only that, but he doesn't get the hockey mask for another two films.
* CutPhoneLines: As the killing intensifies, Camp Crystal Lake's phone lines are cut so that cast are stranded in the premises.
* DaylightHorror: [[spoiler:Jason's first onscreen appearance takes place in a nightmare that Alice has, where he attacks her in the middle of a lake]].
* DeathByMocking: Ned is the jokester of the group, which seals his fate.
* DeathByRecognition: Steve Christy dies as he approaches the person he recognizes.
* DeathBySex: This film probably made it a staple for slasher flicks. This is how Barry and Claudette and Jack and Marcie die.
* DecoyProtagonist: The film follows Annie at the start. [[spoiler:She gets killed off and Alice ends up becoming the FinalGirl.]]
* DestinationDefenestration: Brenda's corpse is hurled through a window to the cabin where Alice is taking refuge.
* DwindlingParty: Annie is the first to go before she even reaches the camp; then Ned, Jack, Marcie, Brenda, Steve and Bill are killed off one by one in that order. The only one to survive is [[FinalGirl Alice]].
* EarlyInstallmentWeirdness: No hockey mask, [[spoiler:Jason is just a delusion of his insane mother... until the TwistEnding.]]
* FinalGirl: [[spoiler:Alice has to deal with the mad Pamela alone]].
* FollowTheLeader: Victor Miller, who wrote the film, admitted that his idea for the film came from ''Film/{{Halloween 1978}}''.
* {{Foreshadowing}}: Brenda rescues Ned from drowning, which turns out to be faked. [[spoiler: She attempts to rescue a child crying from help, but that turns out to be fake also, leading to her to be ambushed by Mrs. Voorhees.]]
* TheGenericGuy: Bill. He [[DecoyProtagonist seems to be]] the heroic male role, but [[spoiler: gets killed off screen without any fuss.]]
* GroinAttack: Alice buys herself some time with a well-placed hit on her attacker's groin.
* HoistByHisOwnPetard: [[spoiler: Pamela Voorhees is decapitated with her own machete.]]
* HorrorDoesntSettleForSimpleTuesday: A triple-whammy as the movie takes its place on the eponymous day, Jason's birthday, ''and'' on a full moon!
* HostileWeather: Rain and thunder break out halfway through the film, and are backdrop to the deaths of Jack, Marcie and Brenda.
* ImprovisedWeapon: Alice defends herself with a poker, [[FryingPanOfDoom a frying pan]], and [[PistolWhipping an empty rifle]].
* InstantThunder: Happens as Jack and Marcie prepare for lovemaking.
* InterruptedIntimacy: Happens when [[spoiler:Pamela Voorhees]] kills Barry and Claudette.
* JumpScare: [[spoiler:Jason's sudden appearance]] near the end.
* KilledMidSentence: Barry in the opening tries to explain that he and his girlfriend were just messing around, but is killed in the middle of it.
* LargeHam: Crazy Ralph and Mrs. Voorhees chew enough scenery that they probably had wished the cook hadn't been killed.
* LeaveTheCameraRunning: Through gratuitous {{Padding}}. Many times throughout the film a character exits the frame and we still haven't cut away. Whenever somebody drives away we see their vehicle ride all the way until exiting the frame (including Crazy Ralph on his bicycle). The worst shot is where Alice is making coffee, which lasts almost two minutes. The movie is at least 10 minutes too long. And only 90 minutes!
%%* LovableJock: Jack
* {{Lunacy}}: When the Sheriff gives Steve a lift to the Camp Crystal Lake, they start arguing about whether or not a full moon has an effect on crime rates.
* MadOracle: Crazy Ralph.
-->It has a death curse!
* MamaBear: [[spoiler:The murderer is motivated by her son's death years before.]]
* MotiveRant: [[spoiler:Mrs. Voorhees rants about how the camp counselors should have watched Jason and Camp Crystal Lake should have remained closed to Alice before trying to kill her.]]
* [[NiceGuy Nice Girl]]: [[FinalGirl Alice]] and Annie are nice, but Brenda is established as being even nicer and more selfless than anyone else, saving Ned from drowning, despite it ending up being a prank, and him being a known prankster and going out in a thunderstorm to try and help a child crying for help.
* NeverMyFault: [[spoiler: Mrs. Voorhees was just as much at fault for her son's death, but she blames everyone else.]]
* NiceToTheWaiter: Mr. Christy gives a generous tip to the waitress at the diner, and the two chat pleasantly suggesting they're friends.
* NoGoodDeedGoesUnpunished: Brenda [[spoiler: ended up being ambushed and killed after going out in a thunderstorm when she heard what sounded like a child crying for help.]]
* NoPeripheralVision: Alice doesn't see Steve's corpse before it drops right on front of her.
* {{Novelization}}: By Simon Hawke.
* OffWithHisHead: How Alice kills [[spoiler:Pamela Voorhees]].
* OffscreenTeleportation: Ned's corpse appears on the top bunk of the bed where Jack and Marcie are making love, without either of them noticing.
* OhCrap: Ned is fooling around, dressed as an Indian chief. Then he turns around and sees that a motorcycle cop has arrived on the campsite.
-->'''Ned:''' Oh shit.
** [[spoiler: The slow motion look on Pamela's fate when she realizes Alice has her machete.]]
* OnceIsNotEnough: Alice has not one but THREE chances to finish off [[spoiler:Mrs. Voorhees]], but runs away each time.
%%* PluckyComicRelief: Ned.
* RainOfBlood: Marcie tells Jack that she has a recurring nightmare of a storm that turns into a rain of blood. This proves to be {{foreshadowing}}, as later blood starts dripping on Jack before he is killed.
* RedHerring: [[spoiler:Jason himself. This only occurs in hindsight, too: while characters mention a "young boy drowning" once, the film doesn't mention it again until Mrs. Voorhees comes in, and by the time she mentions Jason, her demeanor has outed her as the killer.]]
** Steve Christy is tried to be put as a suspect, since [[spoiler: his and Mrs. Voorhees' jeep are the same model.]]
* ShirtlessScene: Steve in his first scene. There's also the scene with the counselors swimming in the lake.
* ShownTheirWork: Brenda checks Ned's throat for blockages before doing mouth-to-mouth resuscitation.
* SlashedThroat: Annie, Ned, and Bill have their throats slit.
* SmokingHotSex: Jack lights a cigarette after sex with Marcie.
* SplitPersonality: [[spoiler:Mrs. Voorhees definitely suffers from this, as at one point her voice alternates between her son's and her own.]]
* StrangerBehindTheMask: [[spoiler:Pamela Voorhees]], a completely unknown character prior to being introduced near the end, killed everyone.
* StripPoker: Brenda's "Strip TabletopGame/{{Monopoly}}".
* SummerCampy: The film helped to popularize summer camps as slasher settings.
* TemptingFate: While playing Strip Monopoly, Alice buys Baltic Avenue. Bill says no one ever lands on Baltic Avenue -- and on his turn, he lands on it.
* TitleDrop: The local sheriff laments the fact that Friday the 13th has a full moon.
%%* TrailersAlwaysSpoil
* UnratedEdition: There's an uncut version with more explicit violence and gore.
* VillainOpeningScene: The film opens with two camp counselors being killed in the fifties.
* WalkingSpoiler: See StrangerBehindTheMask - even if it's a LateArrivalSpoiler given the film's notoriety.
* WhoWearsShortShorts: Steve Christy does.
* YourCheatingHeart: The dialogue between Barry and Claudette in the opening suggests that this is going on.
-->'''Claudette:''' Does Maryann kiss as good as I do?
-->'''Barry:''' How would I know?