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Anime & Manga
- The Scarecrow pulls this on Judge Death in "Judgement on Gotham", a Batman/Judge Dredd crossover comics. Death is not amused...
- Christopher Champion (Tempest) pulls this on a guard at a museum where the Scanner One spaceship was stored in the Atari Force series.
- The first issue of the '80s-era Justice League features a terrorist attack on the U.N. General Assembly. As the spearhead of the Justice League's counterattack, Batman appears suddenly on the podium in front of the lead terrorist, whispering "Boo." Cue both terrorist freak-out and the rest of the League's Dynamic Entry.
- In Bloom County, wheelchair-bound Vietnam vet Cutter John is having tea with his girlfriend's mother. He asks if she's nervous, since some people are nervous around the handicapped. She, smiling, says no. Last panel is him saying "Boo." and her tossing her tea and shielding herself.
- In one Halloween comic strip of FoxTrot, Jason dresses up as a ghost and practices booing. The problem is that he's booing not like a ghost, but like a dissatisfied spectator.
- U.S. Acres: the original strip has an example of Roy trying this on Wade after tying his beak up.
- In Kage, Jade does this to Blunk when they first meet face-to-face.
- In The New Adventures of Invader Zim, Norlock pulls this on Dib when they meet for the first time after Norlock follows him and Zim back to Doomsville. He sneaks up on Dib at Parent Teacher Night and when Dib turns around and sees him, merely says "Boo". Dib ends up shrieking like a monkey and scuttling away.
Films — Animation
- Shan-Yu greets the Emperor this way in Mulan. Played for scares, though the Emperor himself does not freak out.
- Space Jam, after the Nerdlucks transform into the Monstars.
- In Madagascar, after Alex fights off the fossa, he scares off the few that remain standing with a simple "boo".
- In Batman: Assault on Arkham, after escaping from his cell, The Joker simply walks out of the shadow toward a warden and says "Boo." This being The Joker, of course, the warden seriously freaks out.
- In Shrek, Shrek roars at an angry mob of would-be ogre hunters, who are left paralyzed with fear. When he subsequently whispers to them "This is the part where you run away," they finally run screaming.
- In Monsters University, One eliciting a scream from the simulator is what tips Mike off that there's something wrong with it.
Films — Live-Action
- The live-action Casper movie has the clock strike 8 o'clock, showing Casper's a ghost. With a little "Um, boo?" the entire party flees Whipstaff Manor.
- How the Grinch Stole Christmas! has the titular character give a little "boo" when he shows up in Whoville to collect the Holiday Cheermeister award. The gathered crowd screams, which the Grinch responds to by saying "Hot crowd."
- Used by the Lunar Ghost in the first Scooby-Doo live-action movie. Naturally, Scooby screams.
- The Joker Pulls this on Vicki Vale in Batman. Understandably, Vicki screams.
- Undercover Brother. When Lance gets into the limousine next to James Brown he's clearly nervous. James Brown says "Boo" to him and he almost jumps out of his skin.
- Played with in Ghost, where the title character freaks someone out by writing "BOO" on his mirror. Considering that Sam is, well, a ghost, and the person he's freaking out is watching the word trace itself into a fogged mirror, it's not really a "minor" scare at all.
- In The Ninth Gate, Boris Balkan does this after killing Liana in front of her coven, making them all jump.
- In Pete's Dragon (1977), Elliot does this to Hoagy the second time they meet, when Hoagy comes to deliver the message that Pete's been captured.
- In Doctor Strange (2016), Christine gets a face full of the supernatural as she attempts to keep Strange alive while he battles a villain in the Astral Plane. After ghosts, poltergeist-like disruptions, and a magical portal in front of her very eyes, she's scared witless by a broom falling to the floor.
- The main character in Eden Green concentrates so hard on aiming her gun into the shadows, she doesn't notice the playful psychopath Tedrin sneaking up on her until he whispers, "Having fun yet?" This gets him shot.
- Mystery Science Theater 3000:
- When Mike and the 'Bots have The Screaming Skull inflicted upon them, Crow decides to pull a prank on Mike — dressing up as a skull and giving a feeble "raaar." The resultant meltdown by Mike has to be seen to be believed.
- Mike's on the giving end in another episode, wherein he scares away Krankor by muttering "Ahh."
- Bones: Temperance Brennan playfully says "Boo!" to a security agent at an airport... just as he finds a human skull in her bag. It works.
- In Spyro 2 Ripto does this to Moneybags right after Moneybags said he'd give Ripto a piece of his mind if he was there.
- In Halo 2, the Master Chief does this after the Gravemind teleports him into High Charity and he finds himself standing right next to a very startled Grunt. The Grunt reacts by screaming in terror, throwing his gun, and running away. The MC then calmly grabs the gun and begins fighting his way through the Covenant capitol.
- Haunting Starring Polterguy: When the Sardini family's fear level is on high or very high, even less impressive fright 'ems will set them off and they look for a way to escape the house.
- Variation in Brawl in the Family. Dedede and Meta Knight are stuck together by a Gooey Bomb and as Dedede is sweating Meta Knight flatly says "Boom" to get a rise out of Dedede.
- Gunnerkrigg Court on page 153, when Mort tries to sneaks up on Kat and Annie sneaks up on him.
- In Punch an' Pie, Angela comes home to this when she meets Erik for the first time.
- In the Tex Avery cartoon "Slap-Happy Lion", a mouse scares a lion with a flat "boo". Doing it repeatedly drives the lion mad.
- Droopy, given his knack for Offscreen Teleportation, has done this a few times.
- Variant in 2 Stupid Dogs. The big dog will scare cats by going to up to them and giving a deadpan "Woof." The cat will then comically seize up in fear.
- In the U.S. Acres episode "I Like Having You Around", Wade tries to convince a bug that he's not afraid of him. However, the bug just says "Boo" to him in this manner, causing Wade to freak out and run in a panic.
- Raven does this to Beast Boy in an episode of Teen Titans.
- This was also exhibited in the first act of the Mr. Bogus episode "Bookstore Bogus" with a pair of ferocious worms that Bogus encounters in a book about bugs. When Bogus claims that he's not afraid of them, the worms look at each other for a few seconds before saying "boo" to Bogus in this manner, causing him to run in a panic with the worms hot on his tail.
- In a first season episode of The Venture Bros. 21 threatens Brock Samson with a lightsaber. After finding out the beam isn't solid, Brock leans in close and says "boo" making 21 run away. 3 seasons later after 24 Took a Level in Badass, Brock tries to do the same thing, and ends up getting round house kicked in the face.
- Chow does this to Tohru in Jackie Chan Adventures when he gets the first Oni Mask. Tohru, who has an immense fear of the Oni, freezes in terror before Jade tells him to snap out of it. Tohru later returns the favor when the mask is removed, and Chow flees with his tail between his legs.
- On one SpongeBob SquarePants, SpongeBob and Patrick claim that they weren't frightened by a scary movie. A flat "boo" from Squidward proves otherwise.
- An episode of the Beetlejuice cartoon has Lydia's friends look into the hollow of a tree they believe to be haunted. Beetlejuice calmly says, "Hey, how ya doin?" Lydia's friends flee in terror.
- My Little Pony: Friendship Is Magic:
- In "28 Pranks Later", Rainbow Dash uses a simple "boo!" twice:
Pinkie Pie: She got me gooooood.
- First on Fluttershy in the opening, after having already scared her good with a dragon disguise. She's so jumpy already that she springs away and clings to a branch like a tree sloth.
- Then on Pinkie Pie, while upside-down inside her closet. Pinkie finds it hilarious.
- "Dungeons & Discord": In the RPG world, as "Garbunkle" and "Sir McBiggen" are fleeing from the Squizard inside a cave, Discord suddenly shows up upside-down and says "Boo!" Spike and Big Mac scream.
- In "28 Pranks Later", Rainbow Dash uses a simple "boo!" twice:
- The Loud House has Lucy saying "Boo" in two episodes. One to scare Lynn and the other to scare Lisa and Leni.
- The Grim Adventures Of Mandy And Billy: Mandy does this to Fred Flintstone.