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- In Kill Bill Pt. 2, the swordsmith is unwilling to say Bill's name aloud, so he writes it in condensation on a fogged-up window for the Bride to read.
- In the film, Paycheck, Michael Jennings (Ben Affleck) contractually has his memory erased after completing a job, a wipe that has dire consequences. Knowing he'll need to contact his girlfriend Rachel Porter (Uma Thurman) for help after the memory wipe, he writes a message for her to meet him at their favorite bistro onto her bathroom mirror so that she will see it the next day when the mirror fogs from her shower. The Big Bad figured it too, as he had planted bugs in the bathroom, and saw her mood change from depressed to happy. He instructs The Dragon to position himself so that he's at the same angle as she was, and seeing that she was looking at the mirror they both realize where the message is.
- Constantine. Constantine is sure that Isabel Dodson didn't commit suicide without leaving a message for her sister Angela. He uses a repeated Armor-Piercing Question on a reluctant Angela to force her to admit that she and Isabel used this technique as children. Angela then breathes on the window in Isabel's room, revealing her final message to her sister.
- James Bond's contact Luigi Ferrara leaves a message for him in his hotel room using this method in For Your Eyes Only.
- The heart the daughter drew on the window in Flightplan confirms that Jodie Foster's character isn't going crazy and hadn't just imagined that her supposedly-dead daughter was on the plane.
- In Harry Potter and the Half-Blood Prince, Lavender huffs on the window of Ron's train compartment and draws an overly-cutesy heart in the condensation.
- In the suspense/horror film Patrick, the titular telekinetic coma patient causes the words "You are mine" to appear on the fogged bathroom mirror of a nurse his damaged brain has become obsessed with. When she reacts by yelling how repulsed she is by his psychic stalking, he makes the mirror de-fog and then shatter explosively, cutting her badly with its shards.
- In Rise of the Guardians, otherwise-imperceptible Jack Frost provides Jamie with a sign that the Easter Bunny is for real by frosting over his window and drawing an Easter egg in the frozen condensation.
- In the 2005 remake of The Fog, one of the four teens whose boat is first to fall prey to the haunted fogbank goes into a trance and draws a set of scales on the window. Presumably this is to foreshadow the ghosts' motive of payback for their murders at the hands of the town founders (scales = justice).
- Miss Froy in The Lady Vanishes writes her name with condensation on the train window. When the heroine sees it again, it confirms to her that she's not crazy and something is amiss.
- At the end of I Know What You Did Last Summer, Julie finds the words "I still know" drawn on a fogged-up shower stall, presumably put there by the killer to bait her close enough for him to crash through the glass and attack her.
- In Slumdog Millionaire, the show host writes the letter B on the steamy bathroom mirror for Jamal to notice. It was supposed to be the answer for the next show question but as it turns out - the clue was wrong. Good thing Jamal didn't fall for it.
- In The Demons Grave Nora gets an unsettling message on her bathroom mirror from an unknown entity near the beginning of the book.
- In one of the Johnny Maxwell Trilogy books, Wobbler writes a note on a fogged-up window so he won't forget it, then keeps rushing back to huff on the glass and keep it foggy so the message remains visible.
- Used in an Encyclopedia Brown story where two spies in a hotel pass information to each other without being caught. The first took a shower and drew the info on the mirror, then waited until it faded to leave (he opened a window to speed the process). The second went in and took a shower, copying down the message as it reappeared on the mirror, then wiped the mirror down so no one else would notice.
- In The Haunted Air, a ghostly presence writes on a fogged-up mirror to communicate with Lyle in real time.
- In King Rat, the title character writes a short message to the protagonist in the grime on a window when he's sneaking him out of jail, as speaking aloud would be overheard by the nearby police.
- In Winner Take All by Simon R. Green, a political candidate's hired sorcerers deliver a death threat to his opponent via this trope, magically causing a window to fog up and then "drawing" a leering, speaking face in the fog with the tracks of dripping water.
- How to Survive a Horror Movie cites a ghost's writing "Get out!" in the fog of your bathroom mirror every damned day as a sure sign that said ghost is of the "Attention Whore" type. "Yes" might also appear, if Death has accepted your offer to do The Grim Reaper a favor so your preordained demise will be deferred, but only if the writer can't come up with anything more original.
Live Action Television
- CSI: NY had this in "Unspoken"...the villain opens fire at a political rally and though no one is hit, he realizes Lindsay saw him. He goes into her hospital room wanting to kill her and writes 'I'm sorry' on the window. He doesn't kill her, because he realizes she's a mother and has a big thing against hurting kids, but the next morning, Lindsay's husband, Danny, is standing by the window with his coffee, and the steam reveals the would-be killer's words.
- In CSI: Miami, they use this principle to reveal shoe prints after a woman is electrocuted while taking a bath.
- In an episode of Angel, Spike has been reduced to being a ghost and can't be seen and can BARELY interact with the world. He manages to write a single word in the condensation while Fred showers.
- A message revealed by steaming a mirror provided a clue on the pilot episode of Whodunnit?.
- Used on Buffy the Vampire Slayer when Faith entices Buffy into ditching school to go slaying by breathing on the classroom window, then drawing a heart and 'staking' the middle of it with her finger.
- Doctor Who: Disguised as a cleaning lady in "The Green Death", the Doctor discreetly signals Captain Yates by soaping up a window, writing a message in the suds, then wiping it away.
- In "Pyramids Of Mars", when Sarah Jane is trapped in the "Decadron Crucible" on Mars, the Doctor tells her to "R-E-L-A-X" by writing in the dust/condensation on the surface of the tube (for bonus points, he even writes it backwards).
- Adelaide finds a message written on glass in a window overlooking a steamed-up laundry in the pilot episode of Houdini & Doyle.
- Supernatural. In "Of Grave Importance", a ghost Bobby Singer gets increasingly frustrated that all his efforts to contact the Winchesters are ignored or dismissed. He finally succeeds with this trope.
- In "Assignment 2" of Sapphire and Steel, a series of 11s appears repeatedly in the grime on a hotel room window, indicating the exact date and time of Private Sam Pierce's death.
- In Ghost Wars, the main character actually watches the words "No Hope" manifest eerily on a mirror. In this case the condensation itself manifests from nothing, conveying the impression that a ghostly presence is making the mirror colder in a humid room, everywhere except the lettering.
- In Azada, turning on the hot water in the bathroom reveals which two symbols to click on to open a locked chest.
- In Azada: Elementa, a figure behind some French doors you need to open writes a warning on the doors' fogged-up glass.
- One of the clues in the Stonehenge site's RV from The Omega Stone can be revealed in this way by entering the shower stall and turning it on.
- In Dark Fall : The Journal, you need to re-start the hotel's running water so you can steam up one of the bathroom mirrors and expose a lyric. In Dark Fall : Lost Souls, Verney's ghost writes a clue in the grime on a different bathroom's mirror.
- In Morpheus, turning on the steam room's taps fogs up the door to reveal a bible verse, which doubles as Grace Thermon's stateroom code.
- Mystery Case Files:
- In Escape From Ravenhearst, the push-button combination to a padlock appears on a bathroom mirror once you repair the water heater and turn on the hot-water tap.
- In Shadow Lake, a series of symbols is written in the condensation on the inside of a car window. A dying man inside the car wipes it away, but you can re-view the cinematic if you miss any of the symbols the first time around.
- In chapter 2 of The Cat Lady, Susan figures out the fellow patient's mother's name by leaving the hot water running under the bathroom mirror, revealing part of the name written on it with a finger. Figuring out other parts requires being drugged.
- In Resorting To Danger, one of the Dossier sub-series of Nancy Drew games, a password can be revealed on the see-through door of an industrial dryer if you turn it on so its window steams up.
- In Alice Is Dead, a mirror in the nightclub has a hidden message that can be revealed by messing with the club's air conditioning.
- In Rhiannon: Curse of the Four Branches, an unseen presence writes a clue on the upstairs bathroom mirror when you turn on the hot water and let it steam up.
- In Bioshock 1, Andrew Ryan, in trying to stop you from reviving Arcadia, gasses Julie Langford in her lab, and just before dying, she scrawls the code to her safe on the window.
- The passcode to the keycode door in Another Code can found by blowing into the mic, causing the window to fog up and reveal the code.
- One of the late game tasks in Last Window is investigating another tenant's room for clues as to what he's up to. Running the sink with hot water reveals a passcode in the mirror that you need to open a safebox.
- The setup is seen in an episode of The Simpsons where Homer & Marge are trapped in a revolving door that dropped on them from a hurricane. Homer writes on the glass, "Save her first."
- In The Simpsons Movie, after the Simpsons escape the dome, Colin breathes on the glass inside and writes down a musical staff with notes, dubbed "Lisa's Song", which Lisa then vocalizes.
- On Steven Universe, when Steven traps himself and a girl in a bubble-shaped, soundproof magic shield, they both breathe on the sides and draw in the resulting condensation to try and convince Onion to break it and free them. Steven tries to get him to use a harpoon gun with a complicated drawing. Connie just writes "harpoon gun".