[[caption-width-right:200:That's not a proper SlipknotPonytail, young lady!]]

'''''April Fool's Day''''' is a {{slasher movie}} from the year 1986. It was directed by Fred Walton, who also directed ''WhenAStrangerCalls'' seven years prior.

Muffy St. John is rich and she is about to inherit an old house on an island. She decides throw a party to her pals from college in there on April Fool's day. But weird things soon start to happen, as someone has stored very different kind of April Fool pranks for the guests... [[spoiler: And the subversions. Oh god, the subversions!]]

Got a loose remake in 2008.
!!Examples contained within this book. Gotcha!

* AllWomenAreLustful: Judging by the kitchen conversation, Muffy, Kit and Nikki love lots and lots of sex. Even Nan, the supposedly repressed good girl got pregnant.
%%* AprilFoolsPlot
* BookEnds: The jack-in-the-box appears in the opening credits and shows up again in the last scene.
%%* BringMyBrownPants
* CameraFiend: Chaz.
* CatScare: Skip is scared by a cat before he is attacked.
* CaughtInASnare: Arch when he is in the forest.
* CerebusCallBack: Inverted. The first time the jack-in-the-box is seen it scares Muffy with a lizard head and the second time it's just a clown.
* ClosedCircle: The island.
* CountryMouse: Hal.
* CoughSnarkCough
-->'''Kit''': "And don't anyone say 'April Fools' again or I'll rip them apart!"
-->'''Skip & Arch''': "*Cough*april fools*cough*"
%%* DeathBySex
* DoNotCallMePaul: It's not Harvey, it's Hal.
* TheDogBitesBack: [[spoiler: Nan's little joke at the end]].
* EvilTwin: [[spoiler: Muffy's "twin sister" Buffy who is really just Muffy. Skip is her twin though and is evil in the original book]].
* ExplosiveCigar: Harvey smokes one.
* FinalGirl: Nan seems most likely to be this, then gets killed third. Kit then seems to be the FinalGirl [[spoiler: but of course it's subverted when everyone lives]].
* FreudianExcuse: [[spoiler:The jack-in-the-box moment that scared Clara in the flashback could explain her fascination with pranks]].
* HorrorDoesntSettleForSimpleTuesday
* InsistentTerminology: See DoNotCallMePaul above.
%%* KnifeNut
* PeekABooCorpse: Much of the scares are made of findings of corpses and severed heads.
* PortraitPaintingPeephole: Kit and Rob find one in their room, but there is only cat-clock with moving eyes behind it. It later reappears in much less amusing fashion.
* ReallyGetsAround: Nikki. Sleeps with Chaz but is clearly up for sex with Arch later in the weekend, not to mention flirting openly with Hal.
* RedHerring: [[spoiler:Buck ("They did it!")]] and [[spoiler:Muffy's strange behaviour after the first night]].
* TheReveal: [[spoiler:It's all in the movie's name]].
* ScaryJackInTheBox: Muffy was given one when she was a child.
%%* SlashedThroat
* SlashersPreferBlondes: Interesting case since all the female victims are blonde, including the FinalGirl while Muffy is brunette. [[spoiler: Of course then subverted when nobody gets killed at all]].
* TenLittleMurderVictims
* WinkDing: Not actually a "ding", it's the film's leitmotif.
* WolvesAlwaysHowlAtTheMoon: Subverted. It was Skip, drunk as hell.