[[caption-width-right:270:Ha! Caught you red-handed!]]

->''When the flies start to crawl, so will your flesh...''

''Four Flies on Grey Velvet'' is a {{giallo}} film by Creator/DarioArgento from the year 1971, and last one in his "animal trilogy".

One day, professional drummer Roberto Tobias notices a strange man clad in black, who is following him everywhere. One night he goes after the man, and as he tries to question the man, the confrontation goes very wrong as the guy ends up being stabbed by his own knife and a mysterious masked person takes a picture of Roberto holding it. Soon after, Roberto starts receiving messages from that person which indicate that his life is going to become living hell, and he will be murdered at one point.

!!''Four Flies'' has the examples of:

* AbusiveParents: Killer's stepfather.
* AsTheGoodBookSays: The Professor boasts that he knows over 1200 lines from the bible. He quotes about two.
* AccidentalMurder: Roberto accidentally stabs the guy who has been following him. [[spoiler: Or more precisely they want him to think that he did]].
* BulletTime: Used when killer fires a shot at Roberto during the climax.
** The killer's death also involves slow motion.
* CampGay: Detective Arrosio. He meets another one during his investigation.
* CutPhoneLines: The killer cuts the phone line to Roberto's house while Roberto is on the phone to God.
* EveryCarIsAPinto: After the killer's car crashes, its engine explodes.
* EvilDetectingDog: Roberto's cat.
* EyeRemember: When Dalia dies, police extract the last thing she saw from her retina: four flies on grey velvet.
* FreudianExcuse: The killer hates Roberto because [[spoiler:he's a dead ringer to her father, whom she despised because he [[RaisedAsTheOppositeGender raised her as a boy and kept on beating her when she couldn't live up to expectations]]]].
* GilliganCut: When Dalia tries to get Roberto into a relaxing bath, he angrily responds that he will not. Cue to the next shot where he is sitting in a bath.
* InSeriesNickname: "God" for Godfrey. Also, The Professor.
* MotiveRant: Roberto learns about the killer's motive as he is held at gunpoint.
* NightmareDreams: When Mirko tells about a beheading he saw, Roberto starts to have nightmares where his [[OffWithHisHead head is lopped off]]. Not until the very end does he realize that he actually [[spoiler: dreamt about his wife, not about himself. Though his [[ExactWords explicit verbal revelation]] thereof is included in director's cut only - in a theatrical one it's left to the audience.]]
* NoEnding: [[spoiler: Nina, driving away in Roberto's car, smashes into the back of a garbage truck at full speed. The audience sees this happen in ultra slow-mo. Her [[OffWithHisHead severed head]] comes flying out of the wreck.]] The car [[EveryCarIsAPinto explodes.]] Freeze-frame on the explosion. Roll credits.
* OffWithHisHead: Roberto repeatedly has nightmares about this happening to him. [[spoiler: It happens to Nina for real at the end.]]
* PeekabooCorpse: The killer leaves Roberto's dead cat inside a cabinet for him to find.
* PluckyComicRelief: The postman.
* RedHerringMole: [[spoiler:The crippled neighbour]].
* TheReveal: Two of them:
** The fact that [[spoiler:the guy whom Roberto thinks he killed is actually still alive. The killer herself offs him later on]].
** The killer's identity, [[spoiler:who is actually his wife Nina]].
* SearchingTheStalls: Arrosio does this when he hunts for the killer in the bathroom at the train station.
* SlashedThroat: Roberto's maid Amelia thought she could blackmail the killer. She gets her throat sliced instead.
* SlowMotion: [[spoiler: Nina's]] demise.
* SoundtrackDissonance: Serene music plays while the killer dies.
* SpitefulSpit: Marosi spits on the killer's face before being finished off.
* SunGlassesAtNight: The man who keeps following Roberto around wear sunglasses at all times.