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1In which a character touches a blood stain with his fingers, usually in order to make sure that it actually ''is'' blood.
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3Sometimes, it [[ABloodyMess turns out to be ketchup or strawberry jam]] (something that's red, goopy and fake), especially if another character has been doing a Chicken Little impersonation over the supposed bloodstain. Being a [[OurVampiresAreDifferent vampire]] or a [[{{Cyborg}} cyborg]] may also help for analysing the type of blood. In RealLife, it's possible that some animals (bloodhounds, brown bears, tyrannosaurs, larger sharks) may have a sufficiently powerful sense of smell, this (or simply sniffing the blood) might actually allow them to [[MysteriousAnimalSenses determine the species or even the individual victim involved]].
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5See also SniffSniffNom, FingertipDrugAnalysis. ''Not'' to be confused with [[Radio/APrairieHomeCompanion The Ketchup Advisory Board]].[[labelnote:*]]Although those natural mellowing agents may account for the unscientific behavior...[[/labelnote]]
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7!!Examples:
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11[[folder:Anime and Manga]]
12* The title character of ''Manga/InuYasha'' is half-{{youkai}} and has the supernaturally sensitive and accurate canine sense of smell to show for it, with the result that he's frequently shown noticing the scent of blood over considerable distances, and can recognize when the blood belongs to someone he knows personally.
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15[[folder:Asian Animation]]
16* In ''Animation/PleasantGoatAndBigBigWolf: Mighty Little Defenders'' episode 1, the wolves are hurt and have what appears to be blood on them. Wolffy tastes the blood to make sure it's actually blood, and then he says it's just tomato sauce.
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19[[folder:Comic Books]]
20* ''ComicBook/CaballisticsInc'': During the mission at the Luddgate studio, Hannah tastes some of the blood the team finds all over the floor. It's not real, being merely KensingtonGore, but the blood itself is drippling down from mid-air.
21* In a Creator/MarvelComics ''[[Comicbook/TheTombOfDracula Dracula]]'' story set during World War II, Dracula identifies a bloodstain as "gypsy blood" this way. Well, he is a [[JustifiedTrope vampire]]... (Nazi troops were killing Roma. The Roma in Transylvania are protected by Dracula. Bad Move.)
22* Lehrigen, a human from the ''Wild Hunt'' subseries of ''ComicBook/ElfQuest'', is an expert hunter and tracker, and can tell human and elfin blood apart by smell and/or taste.
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25[[folder:Fanfiction]]
26* In the prequel to ''Fanfic/DragonAgeTheCrownOfThorns'', the middle Aeducan child sends a red-soaked nug into a feast full of dwarven nobility. After mayhem ensues, the visiting King Maric tries some and announces it's cherry jam.
27* In ''The Keening Blade'' (''VideoGame/DragonAgeOrigins'') the slightly-mad Maude samples the bloodstains available in Warden's Keep:
28-->"Walking dead and raspberry jam?" Maude complained. "There's raspberry jam on the votive candles! What kind of chapel is smeared with raspberry jam?"
29-->"What kind of chapel is full of mindless zombies?" Loghain wondered, laying another one low.
30-->"All chapels," Morrigan shot back. "And that looks like blood to me. How do you know it's raspberry jam?"
31-->"I tasted it," the girl replied loftily, finishing off the last of the monsters. "It's not blood, it's raspberry jam. I checked."
32-->Kicking a skeleton aside, Loghain snarled at her. "Didn't your parents ever teach you not to put strange red substances in your mouth?" He thought again. "Or any strange substances?"
33-->"I know about mushrooms," she replied. "I'm not an idiot, you know."
34** And there actually ''is'' an inexplicable jar of jam to be found in-game.
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37[[folder:Film — Live-Action]]
38* Actually somewhat justified in ''Film/{{Cornered}}'', since a lot of shelves were knocked over, and it could have very well been ketchup.
39* Parodied in the "Thanksgiving" trailer in ''Film/{{Grindhouse}}'', when two small-town detectives are investigating a murder scene amid the titular holiday parade. And by "investigating a murder scene" we mean, "The headless body is right there and the blood ''is still leaking out of it''".
40-->'''Cop 1:''' (Touches, then tastes) "It's blood."
41-->'''Cop 2:''' "Son-of-a-bitch!"
42%%* Dumbledore in ''Film/HarryPotterAndTheHalfBloodPrince''. "Dragon blood."
43%%* ''Film/LoadedWeapon1'' has an example where it's ketchup, given it's a parody.
44* Gimli tops it by tasting the orc blood in Peter Jackson's rendition of ''Film/TheLordOfTheRings''. While this raises the question of how he even knows the difference to begin with, the fact that he immediately spits it out in disgust suggests he's familiar with its repulsive taste. Given that he hacks orcs apart with an axe, it’s perfectly reasonable to assume that he’s been sprayed in the face with orc blood before.
45* The 2001 obscure Nickelodeon movie, ''Film/SnowDay'', had the elementary students try to derail the snowplow man's efforts to remove the snow from the streets since it will reopen their snowed-in school. One of their less successful methods was having one of the students lie in the middle of the street in wait of the snowplow man with ketchup on his shirt pretending to be unconscious. Bemused, the snowplow man simply stands next to the boy, dipping his french fries in the ketchup and eating them.
46* ''Film/StarTrekVITheUndiscoveredCountry'': Chekov finds a dried drop of something pink on the transporter pad, and pokes it before taking a sample. It's Klingon blood, which is what he was looking for.
47** Repeated in the director's cut, with Colonel Worf investigating the pool of blood surrounding the attempted Klingon assassin.
48--->'''Col. Worf:''' [[spoiler:[[LatexPerfection This is not]] [[CaptainObvious Klingon blood...]]]]
49* ''Film/Terminator3RiseOfTheMachines'': This is how the T-X can determine the identity of her victims if there is ever any doubt. (DNA scanners in her tongue. Who'd have thought it?)
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52[[folder:Literature]]
53* In Chris Jericho's autobiography ''A Lion's Tale'', he describes a Ketchup Test incident that occurred during one of his early matches. Jericho bled a lot in this match and one of the ringside fans, believing Jericho's real blood to be ketchup, dipped his finger in a pool of Jericho's blood and put it in his mouth.
54* ''Literature/{{Maskerade}}'': While everyone else in the Ankh-Morpork Opera House is hysterically freaking out about what looks like a blood stain, [[OnlySaneMan Agnes Nitt]] touches the stain, sniffs her finger, and discovers it's turpentine.
55* In Creator/RobertAHeinlein's ''Literature/ToSailBeyondTheSunset'', the protagonist [[BedmateReveal wakes up in a strange hotel room with a dead body in a pool of blood]]. After she phones for help, two doctors arrive. They each dip a finger in the "blood" and taste it. As she is feeling rather sickened, they begin arguing over whether it is Heinz or Skinners brand ketchup.
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58[[folder:Live-Action TV]]
59* Series/{{Angel}} does this from time to time. Being a vampire, it makes sense he can automatically tell if something is blood from looking closer at it.
60* In an episode of ''Series/{{Beastmaster}}'', Dar sees a spilled blue fluid and dips the tip of his spear in it so he can examine it without having to crouch. It turns out to be unicorn blood, and the blood on the spear makes it child's play for an EvilChancellor to frame him for attacking the unicorns.
61* In an episode of Series/{{Bones}}, a street sweeper mulches up the body of the episode, one of the drivers assumes he's being pranked and tastes the "fake" blood to try to determine its contents. [[{{Squick}} His partner vomits.]]
62* ''Series/{{Bunkd}}'': In "Inn Trouble", after seeing Finn licking the "dirt" off of his arm, Gwen reaches over and puts her finger into the "blood" on his elbow and tastes it, recognizing it as raspberry jam. Lampshaded by Destiny who asked her what if it had been blood.
63* ''Series/ChappellesShow'': Dave Chappelle explains that since semen is also a tool used by police to frame the black guy while doing their jobs, they might check that instead.
64* ''Series/CobraKai'': At the end of Season 5, [[spoiler: Kreese]] is in prison and gets fatally stabbed by another inmate during a cafeteria altercation. After he's hauled off to the infirmary, the physician sniffs his blood and then ''tastes'' it, much to the [[{{Squick}} surprise]] of a nearby guard. [[spoiler: He notes that the "blood" is actually Jell-o, right about the time Kreese gets up and executes the [[CurbStompBattle next step]] in his escape plan.]]
65* Inverted in ''Series/{{Community}}''. Britta sees a red stain on Jeff's shirt and is afraid it's [[PaintballEpisode paint]]. But with a relieved sigh he realizes that it's just blood.
66* Though it wasn't blood that he tested it with, Gil Grissom did this twice in ''Series/{{CSI}}''. The first time, Brass merely stared in horror at him; the second, Catherine warned him how unsanitary it was.
67* ''Series/DoctorWho'': In [[Recap/DoctorWho2005CSTheChristmasInvasion "The Christmas Invasion"]], the Doctor does this. He then tastes the blood and identifies it as "A-positive, with just a dash of iron" (although his BizarreAlienBiology could let him do this).
68* In an episode of ''Series/{{Fringe}},'' the ketchup test is notably {{averted}}. The team finds a reddish stain on a piece of evidence left at a kidnapping scene, believing it at first to be blood, but they bag it and submit it for analysis only to discover that it is not blood but hot sauce.
69** Walter has a recurring habit of tasting whatever disgusting thing they're dealing with and then revealing it's just some food he left lying around in the lab. He's done this with what appeared to be blood, brain matter, and cremated ashes. Taste is apparently the most important sense for scientists.
70** Given that, the hot sauce example seems particularly notable, since it would be a perfect specimen for Walter's SniffSniffNom antics, since hot sauce generally has a distinctive odor.
71* In a sketch in ''Series/HorribleHistories'', Viking Paramedics ''know'' it's blood already. They taste it because they believe they can figure out what's wrong with the patient by doing so. [[SurprisinglyRealisticOutcome They can't]]. This sketch is accompanied by the most, if not the only, truly serious DontTryThisAtHome warning on the show.
72* ''Series/TheXFiles'': In the episode "[[Recap/TheXFilesS03E11Revelations Revelations]]", Mulder dabs his finger in "blood" and '''licks''' it. He promptly informs Scully that it has too much sugar. The look on Scully's face...
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75[[folder:Video Games]]
76* As a prototype android, Connor in ''Videogame/DetroitBecomeHuman'' can analyze fluids by tasting them with his tongue, which also has the tendency to disgust his human partner Hank.
77* ''VideoGame/ResidentEvil1'': "I hope this is not Chris's blood..."
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80[[folder:Web Video]]
81* In {{WebVideo/Idiotsitter}}, during the episode "Fight Day", Gene surprises Billie in a dark garage, and paint cans fall on her. Hours later when Billie wakes up, she's got red all over her shirt and screams, before she realizes it's paint.
82-->'''Billie:''' Oh, it's just paint.\
83'''[[DumbBlond Tansy]]:''' Well its about to be... not paint. [[DontExplainTheJoke Blood, is what I'm saying.]]
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86[[folder:Western Animation]]
87* "Last Christmas!", a Season 2 episode of ''WesternAnimation/DuckTales2017'', saw Dewey Duck go back in time to meet his uncle Donald and mother Della, back when they were kids. He and Donald go looking for Della who has gone camping in the huge expanse that is Uncle Scrooge's backyard, and they come across a reddish substance smeared on a tree. Without hesitation, young Donald walks up, takes a huge lick of the unknown substance off the tree.
88-->'''Young Donald:''' Yep- strawberry jam!
89-->'''Dewey:''' What would you have done if it weren't?
90* Parodied in one episode of ''WesternAnimation/MyGymPartnersAMonkey'' when Jake, Winston, and Snips are investigating if Adam ate his parents. They find the remains of Adam's ketchup sandwich, and Jake does the test to confirm if it's blood. Of course, it turns out he doesn't know what ketchup taste like, so not only does he think that it's blood, he thinks that blood taste delicious.
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