A character is bloody, and the people nearby start to panic, but then the character says something to the effect of, "Don't worry, it's not MY blood." Easy way for writers to create a Wham Line.
Could overlap with Noodle Incident if the incident that led to the character being covered in someone else's blood isn't even explained.
- Inverted in Darker Than Black: Protagonist Hei is fighting a Contractor named Wei who has the ability to destroy anything his blood touches with a snap of his fingers. Hei fakes his death by using blood from one of his own open wounds to smear on himself while simultaneously dodging Wei's actual blood. This allows Hei to have a Big Damn Heroes moment later after Wei thought he's won and nothing stands in his way.
- Detective Conan has Conan rescue Ai from a bomb explosion, then tells the police to take her to the hospital because she has hurt her leg pretty badly. When the Detective Boys express concern about her apparent injuries, Ai tells them not to worry because it's not her blood. A later panel reveals that it's Conan who is injured, and it's his blood smeared on Ai's leg.
- In Brit (an Invincible spinoff), the titular Brit is completely invulnerable to any form of damage whatsoever. Thus when he emerges from a battle with a nosebleed, he reassures his allies that it's not his blood, but that of the alien he was beating up. It doesn't stop his superiors from deciding that he needs to be cut up and replicated. Later, after he's persuaded to return to defend the planet, we see it happen again... This time, it actually is his blood, because this one isn't the real Brit. He's actually an imperfect clone whose invulnerability is starting to wear off.
- Cuban movie Vampires in Havana has the main character, Pepito, being given a glass of blood as a "last dinner" but he spit it all over his shirt. When one of his friends finds him (who wasn't aware of his dealings with vampires) he gets on his knees completely shocked, but then pepito reveals his undershirt that is completely white and his friends laugh.
- In Die Hard with a Vengeance, McClane sports blood on his face after an action sequence. When asked by his partner if he is alright, he shrugs it off noting that it's not his blood.
- Elevated: Hank bursts into the elevator with his shirt covered in blood and holding a knife. After getting shocked reactions from Ben and Ellen, he explains that it's not his own blood, which only worries them even more when they assume he just murdered a bunch of people. He has to explain further that he didn't kill them, the building is actually being attacked by monsters and he only barely managed to escape.
- When police officers Tim and Janne show up at Iben's place in The Guilty, her six-year-old daughter Mathilde opens the door covered in blood, which she says isn't hers. When the dispatcher Asger hears this, he gets worried, because he knows that her infant brother Oliver was also supposed to be at home
- This is part of The Reveal in I Still Know What You Did Last Summer. One of the teens is apparently killed by the villain that has been stalking them, but later reappears, albeit covered in blood and in pain, making it seem that he was severely wounded and Left for Dead, but managed to survive. When Julie goes to treat him, however, she realizes after a few seconds that she can't find any actual wounds. He then tells her that the blood wasn't his, and he's really been helping the killer take them down.
- In Mad Max: Fury Road, when Max returns from killing the Bullet Farmer offscreen, his face is covered in blood. One of the Wives asks if he is hurt because he's bleeding but Furiosa answer for Max in an admiring voice "That's not his blood".
- In The Royal Tenenbaums, the father gets all worked up over one of the kids having blood on his forehead. It turns out to be dog blood.
- Unforgiven. After the climactic gunbattle in which William Munny kills Little Bill and most of his deputies, Munny hears moaning coming from a pile of bodies. Mr. Beauchamp (Little Bill's biographer) moves a dead body off of himself, sees a patch of blood on his chest and says "I'm shot! I'm shot!" Munny tells him "You ain't shot", and he's right. The blood came from the dead man lying on top of him.
- The Welsh folktale Gelert the Dog is a variant of this; a nobleman goes hunting and leaves his baby son in his crib, under the care of his loyal guard dog Gelert. A wolf breaks into the house and Gelert fights it off, getting covered in the wolf's blood in the process. The nobleman comes home, sees Gelert covered in blood, assumes Gelert mauled his son and kills him in anger, only to realise his mistake when he hears his son crying and finds the wolf's corpse in the house.
- In A Dog's Purpose, Bailey bites Todd after he sets fire to his house and gets covered in his blood. The cops initially think Bailey got injured but they soon notice it's not his blood. Todd's Revealing Injury gets him arrested.
- In Warrior Cats, this happens occasionally in battle. One notable instance is when in Outcast, Lionpaw - one of The Chosen Ones, whose special power involves invulnerability and fighting skill - comes out of a rough battle completely covered in blood. His siblings panic, assuming that he's badly injured, and are shocked to discover that none of it is his own.
- In Carmilla, Laura glimpses the eponymous vampire standing over her bed covered in blood, in what she assumes is a prophetic dream of Carmilla being murdered.
- In the opening scene of the The X-Files episode "Demons", Mulder wakes up in some hotel room and notices blood on his shirt. He calls Scully and when she asks if he is hurt, he replies "I don't know... [beat]... I don't think it's my blood." - Sting!!!.
- In the pilot of Outlander, Jamie returns from a fight full of blood. Then this conversation happens:
Gloria: You're hurt.
Jamie: This lot isna my blood. (looks down on himself) Not much of it, anyway.
- In season 5 of Justified, Chief Deputy Art Mullin is escorting Raylan's girlfriend to protective custody. Darryl Crowe, Jr., assumes that Raylan, himself, would be escorting his own girlfriend and sees this as a perfect opportunity to kill Raylan. However, instead of getting a bead on Raylan to be sure, he fires wildly, sending Art and Allison scrambling. In the aftermath, they check for injuries.
Art: (stands up from covering Allison) Oh, you're bleeding!
Allison: (looks at her shirt and then at Art) It's not my blood...
- A variation in an episode of M*A*S*H. While treating a patient with a compound fracture (when a broken bone protrudes through the skin), Col. Potter says that it can be removed entirely... as it's not his bone. The soldier in front of him stepped on a land mine and his leg bone was driven into his compatriot beside him.
- In Altered Carbon episode "Force of Evil", Kovacs goes through a Roaring Rampage of Revenge at the Wei Clinic, resulting in his shirt being soaked in the blood of many victims. When his sidekick arrives, he asks about the blood to which Kovacs replies in a dead-pan tone "It's not mine". Watch the scene here.
- Law & Order: Special Victims Unit: In one episode, the SVU breaks up a sex slavery ring in New York City, ending with a raid on one of the brothels and a Shoot the Hostage Taker resolution. As Agent Benson escorts one of the women—who was splattered with the criminal's blood—away, she reassures Agent Stabler, "Don't worry, it's not her blood."
- In Community episode "History 101", the Dean institutes "The Hunger Deans", a ridiculously elaborate series of physical competitions, the prize of each one being a plastic ball granting a seat in the class. Jeff is taking part in the competition and at one point Shirley is concerned that Jeff is bleeding out on to his shirt. He reassures it isn't the case, it is only Leonard's blood.
- In Babylon Berlin episode 2, the hero gets splattered with blood from a suspect who committed suicide. When the heroine finds him later at the police department's bathroom she gets worried until he tells her that it's not his blood.
- Caleb in Blood alludes to that with a line at the start of E3L4: The Sick Ward: "I'm here to donate some blood... someone else's."
- A variation happens in Gears of War 2 when the team cuts their way out of the riftworm one of them says "This is wrong, I'm coughing up blood that isn't mine."
- In God of War (PS4), when Baldur punched Atreus in an attempt to protect his father, Kratos is initially worried when Atreus shows up blood only for him to reveal that it isn't his, instead it is Baldur's whom by punching a mistletoe, his immortality gets broken and he can now be harmed by normal means.
- One of Bill's voice lines when being revived in Left 4 Dead: "Mosta this blood ain't mine".
- Cyanide & Happiness plays it for Bloody Hilarious in this strip where a character throws up blood only to add that it's not his.
- Gunnerkrigg Court: To train her as the Medium of Gillitie Wood, Ysengrin brings Annie to a meeting with Forest creatures that quickly turns into an all-out brawl. She and Ysengrin quickly beat them into submission, but her friends are a bit startled to see her come back with her clothes charred and splattered with Ysengrin's blood.
- In Wilde Life, Oscar gets splattered on with blood from a werewolf and is subsequently forced to explain himself to other characters who get worried seeing him like this.
- S.S.D.D: One where the splattered one has to be reassured it's not theirs when Adams shoots Gates while he's holding a gun to Tessa's head.
- Following a cargo loading accident with Powered Armor in Schlock Mercenary one of the grunts tells their medic he broke a tooth with his kidney, then explains it wasn't his tooth.
- Everyman Hybrid: During "May & June", the boys get spooked by something they believe to be the Slender Man and Evan attacks it with a machete off screen. When they come back, they're covered in blood, which Alex initially thinks is their own. However, it was actually the blood of a deer Evan had slaughtered.
- Discussed but subverted in The Simpsons episode "Bart the General", when Bart gets into a fight with Nelson.
Franklin: Nelson, y-you're bleeding.Nelson: Naw, happens all the time, somebody else's blood splatters on me. [realizes his nose is bleeding] Hey, wait a minute... you're right! [to Bart, threateningly] You made me bleed my own blood.