'''''Who Killed Who?''''' is one of the early TexAveryMGMCartoons, created in [[TheGoldenAgeOfAnimation 1943]]. The short is a pastiche of whodunit cases.

Beginning with an announcer proclaiming the cartoon as an educational example of how crime doesn't pay, it is set in an old, spooky house on the "[[IDontLikeTheSoundOfThatPlace Gruesome Gables]]". The elderly owner is murdered (''how'' dead he is, though, is a matter of question) and, seconds later, a crafty detective arrives to investigate--but he finds out that the house is a haunted and wacky place, where finding and unmasking the murderer might prove very problematic.
!!The cartoon short provides examples of:
* BlackCloak: Worn by the killer, along with a black mask.
* BornInTheTheatre: Done with a black silhouette of a "theater patron" who moves around despite the detective's order of "Everybody stay where you are! Don't nobody move!", followed by him knocking out the guy with a club "That goes for you too, bub!"
* TheButlerDidIt: Actually not, but he does act very suspicious, so he might have done some other crime not uncovered yet.
* ByTheLightsOfTheirEyes: Parodied when the eyes visible beyond a door peephole are left shut out when the peephole closes abruptly, forcing them to knock on the door to be let back in.
* CreatorCameo: Tex Avery provides the voice of SantaClaus in his brief appearance.
* CreepyChangingPainting: Of a comedic variety, of course--a painted woman in a bathsuit who has hastily covered herself by the time the detective peeks at the painting again.
* DemBones: A regular skeleton, and a red one (a ShoutOut to comedian "Red" Skelton). Earlier on, a skeletal cuckoo in a clock calls out the time.
* [[spoiler: TheDogWasTheMastermind: The murderer is ''the live-action announcer.'']]
* EekAMouse: Happens to a ghost, [[ThroughAFaceFullOfFur who promptly blushes]].
* ExtendedDisarming: The detective demands "the gun" to be placed on the table. A few seconds later, he ends up with a pile of various weapons reaching up to the ceiling.
* GenreRoulette: And how. The narrator sets this up to be a 'RippedFromTheHeadlines' true crime story, the opening makes it looks like a HauntedHouse movie while the cast of characters is out of AgathaChristie.
* HandCannon: {{Exaggerated}}. The gun used to "kill" the victim is larger than the shooter.
* HauntedHouse: The setting, complete with at least one ghost and at least two skeletons.
* IDontLikeTheSoundOfThatPlace: Gruesome Gables.
* MaleGaze: PlayedForLaughs--a flashlight spot scans a wall full of hanging pictures, including one of [[GoingFurASwim a scantily clad woman with a fur coat]], but when the spot returns to the picture, the woman is covered up.
* MediumAwareness: The victim is reading a book called "Who Killed Who? [[LogicBomb (From the cartoon of the same name)]]". This is also how he learns of his impending murder.
* ObviouslyEvil: As a gag, when the detective pushes a button marked 'RING BELL FOR SUSPECTS', the butler, maid, and chauffeur come in--and they all look rather sinister. It then turns out that they're actually pretty cheerful.
-->'''Detective:''' Which one of you bumped off the ol' man?! Whodunnit?!
-->'''Suspects:''' Awwww, wouldn't YOU like to know!
* PeekABooCorpse: A closet that holds ''hundreds'' of corpses that fall out one by one, for (presumably) a very long time. Lampshaded:
-->'''Random corpse:''' Ah yes! Quite a lot of us, aren't there?
** Also when the detective is taking a picture of the body covered by a sheet. The victim sits up and poses, then falls back under the sheet. The detective lifts up the sheet:
--->'''Victim:''' Let's not get nosy, bub.
* RogerRabbitEffect: Sort of--the live-action and the animated characters aren't seen together, but some clever cutting [[spoiler:in the ending]] makes it look like this.
* ScreamsLikeALittleGirl: The detective. Though first he uses a small pitch-pipe to find the correct octave.
* ShamefulShrinking: More like "Fearful Shrinking" as it happens to the detective upon encountering a ghost.
* ShoutOut: The killer's gun final three shots at the victim replicate the [[http://en.wikipedia.org/wiki/NBC_chimes NBC Chimes]].
* ShowSomeLeg: The detective resorts to this to catch the killer.
* SpinningClockHands: When the victim receives a message that he is going to die at midnight, he looks terrified at the cuckoo clock; there's still a few hours left, but then the hands suddenly spin all the way to midnight.
* StealTheSurroundings: After the ExtendedDisarming sequence, the detective says they'll try it again. He turns out the lights, and when they come back on ''everything'' in the room (including the bookcases and pictures on the wall) is gone.
* SurpriseSantaEncounter: Western UrExample: the detective sees a door marked "Do Not Open Until Xmas". Scoffing, he opens it, and runs smack into a ''very'' irritated Santa.
-->'''Santa:''' Listen doc, [[CantYouReadTheSign can't you read?]] ''(bops detective on head)''
* ThroughAFaceFullOfFur: A variant--the blushing ghost. How is that even possible?
* WrapAround: The detective drops a vase into a pit in the floor; after a while, it falls on his head from above. Later on, he himself falls into a pit on the ground floor and, after a lot of noise, comes crashing down the stairs that lead to the upper floors.