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- At the beginning of The Negotiator, Danny Roman flashes hand signals (1, 2, and 3 fingers) to alert the sniper team when to fire. The "1" signal is worked into his conversation with the hostage taker as a "wait a minute" gesture, while the others are displayed with his back turned to the suspect.
- Running Scared (1986). Police detectives Hughes and Costanza force Snake to go undercover with a hidden microphone to set up the drug lord Julio. They tell Snake that if he gets into trouble he should say "snakebite" and they'll come rescue him. He does, but it turns out to be a trap organised by Snake and Julio.
- A variation in The Bourne Ultimatum. Nicky, a CIA agent, has just unexpectedly entered a CIA office where Bourne killed two hitmen. The CIA calls the office to check what's going on. As part of standard procedures, they give Nicky a one-word sign, to which she needs to respond with a countersign: either the "normal" countersign, or the "duress" code. Even though Bourne is right in front of her and pointing a gun at her, she responds with the "normal" signóconfirming that she's sympathetic to Bourne and wants to help.
- Hancock: When Hancock is in the middle of his Heroic B.S.O.D., he stops at a liquor store. The clerk rings up $91.10 for one bottle of scotch, which Hancock reacted to angrily at first until he realized how stilted and freaked out the clerk was. The clerk then covers up the zero on the register screen with his finger, signaling "911" and alerting Hancock to the gunman under the counter holding the clerk hostage.
- Triple Cross (1966). The protagonist, a British criminal recruited as a German spy, is told to leave out his callsign XXX if he's been captured. However he has no intention of working for the Germans, so surrenders to police and works as a willing Double Agent for British Intelligence.
- In The Evening News, a news anchor describes to his wife some of his prearanged visual codes to alert people if he's ever kidnapped and forced to send a video message. This comes in handy later when his wife and son are themselves kidnapped by a South American drug kingpin.
- In The Famous Five a standard covert distress call is for George to sign her name 'Georgina' (something that she hates doing) whenever the bad guys inexplicably ask the captured children to send a note to the non-captured ones, to alert them that something is wrong.
- In The Hobbit, when Bilbo is preparing to sneak up on some trolls, he's told that should he get into serious trouble, "hoot twice like a barn-owl and once like a screech-owl, and we will do what we can" — however, it turns out Bilbo doesn't actually know how to make the correct owl sounds, so it doesn't do him any good.
- In Lucifer's Hammer there are two sentries guarding the settlement at any time: an outer sentry to talk to people trying to enter, and a hidden inner sentry who watches and guards the outer sentry. If the outer sentry raises both hands over his head, this is the signal for the inner sentry to shoot the person at the gate, presumably because that is the one gesture least likely to get you killed if someone is pointing a gun at you.
- Han Solo's Revenge inverts this. Han is being marched back to the Falcon at gunpoint, warned to not make any suspicious moves. This is fine, because Chewbacca is waiting for him to give the all-clear signal, and deploys the ship's guns when he doesn't get it.
- Mentioned on the Death Lands book "Pandora's Redoubt". The Companions use a variety of names when greeted by a scouting member for certain actions, like "all clear", "run away" or "kill the guy with me". They explicitly mention that if they use anybody's real name in such a context, they have been coerced somehow and the Companions must shoot the member, whoever is with them, and run the hell away really fast.
- The girls of The Baby-Sitters Club create such a code to use in case one of them is babysitting and hears a prowler. In a subversion, it turns out that they can't remember the code phrases five minutes after creating them, much less in an actual stressful situation.
- Prince of the City, by Robert Daley (later made a film). Two crooks hear a rumor that the protagonist Robert Leuci is working with the DA to expose corruption, and grab him off the street to interrogate him. On two occasions he's able to get to a phone, call the DA's office and give the distress code. Unfortunately the secretary doesn't recognise the code (it's along the lines of "I can't make breakfast", so doesn't sound urgent). Fortunately a member of the Mafia vouches for Leuci, so he's let go and makes his third call. This time the apologetic secretary puts him through immediately, the DA having returned to his office and realised what's happened. After this cockup, Leuci insists that streetwise NYPD cops be included on his protection detail. This saves his life later when Leuci gives another distress signal (involving scratching his head) only for his backup to assume It's Probably Nothing. A cop among them realises otherwise, yanks out the ignition key to forcibly stop their car, and goes to Leuci's rescue.
- In Rainbow Six the security firm monitoring the silent alarm in the Austrian investor's manor/castle have a short duress signal conversation over the phone with a member of staff. They feign being a vet calling about the horses, so as not to alert anyone who might be listening to the call.
- Tom Clancy used one previously in Red Storm Rising, when a young American officer finds himself trapped behind Soviet lines on Iceland. His handlers tell him that if captured, he is to say that things are "Going great." Cue numerous variations of "Things are lousy," "Things could be better," etc. when Mission Control asks how things are going.
- In a considerably less dire example, Area 7 mentions that Gant and Mother have a set of code words that they say when they want out of a conversation, so the other can intervene. When Gant receives a necklace from an Abhorrent Admirer who just won't leave, she offhandedly begins describing another one she saw in Paris ("Paris" being the relevant code word), upon which Mother loudly and profanely points out the rather impressive military complex they're approaching.
- Brotherhood Of The Rose by David Morrell. The CIA are following Rogue Agent Saul until he makes contact with his surrogate brother Chris and they can both be killed. When Saul sets up the meeting, an underling urges spymaster Elliot to let them grab Saul and sweat the meeting place out of him. Elliot turns this idea down, pointing out that Chris and Saul have known each other since they were children and have codes and passwords dating back to then, so they've no way of being sure that Saul couldn't pass on a hidden warning.
- In Andromeda, Dylan Hunt blinks "AC 145" in Morse code during a message he sends to the ship that supposedly states that all is well. "AC 145" means no, he's been captured.
- On The A-Team "Red Ball One" and "Bag is Leaking" mean "big trouble" and "one of the team took some lead" as explained to Amy by Murdock, who receives the code from the team.
- On Flashpoint the leader of the SRU team is taken hostage but the rest of the cops are unaware of this. He is told to give his team instructions over the radio as normal and direct them away from the hostage taker. He complies but tells his team members to "stay frosty" — his team's code word for a situation like this. In a fifth season episode, a nurse is kidnapped and forced to make a call to her significant other that she is working late. However, she is not the first nurse to be kidnapped, and so drops the pre-arranged distress code (Dr. Armstrong) into the phone call.
- In An Idiot Abroad, Karl's distress code in case he gets kidnapped in the Middle East is "congress tart".
- A rookie agent is sent undercover to catch a group of people kidnapping ATM users and is given the distress code "Mexico" to use if the operation starts to go south. It does, but she's too stubborn to use the word, believing that she can salvage the operation on her own. Don berates her for this later and assigns her to answering telephones.
- Later on, when another agent is in a hostage situation, he says that he could ask the FBI to "send out for Mexican" to discreetly let them know that things are not what they seem.
- When Neal Caffrey of White Collar has to go undercover as a foreign man named Mr. Black (whom he assumed was a courier at the time), he is told that if anything bad happens, he should use the words "long flight" to alert Peter. Subverted in that when he discovers that Mr. Black is a hitman and not a courier, he attempts to use the phrase and fails because the criminals have employed a signal jammer.
- Star Trek
- Star Trek: The Original Series episode "Bread and Circuses". "Condition Green" means that the landing party has been captured, they are being forced under duress to communicate with the ship, and that the ranking officer aboard ship is to take no action at the present time. It does not prevent the ranking officer from preparing to take action later, or to exploit any opportunity to rescue the landing party.
- Star Trek: The Original Series episode "Day of the Dove". When Captain Kirk and his landing party are captured by Klingons, he pushes an emergency button on his communicator, warning the Enterprise. When Scotty beams them up he materializes only the Enterprise crew, leaving the Klingons suspended in transit. When the Klingons are finally materialized they are easily captured.
- In Burn Notice
- Ex-spy Michael and ex-terrorist Fiona have developed a number of ordinary phrases they can drop into a conversation to convey meanings like, "this is a trap, be alert" or "this phone call is being made under duress, don't believe anything I'm saying" or "get on the floor and cover up." The last was one Fiona's father taught her and her siblings.
- One time, when the FBI were waiting at Michael's mother's house to arrest him, on the phone call to Michael, she uses the exact same phrase she would use when her abusive husband was on a tirade and she wanted Michael and his brother to stay away from the house.
- In a ninth season CSI episode, Riley communicates to Greg that the situation is normal, but calls him by her name to indicate that she is speaking under duress. Greg responds by calling Riley by his last name to indicate he understands. This was something the team was demonstrated practicing during a drill earlier in the episode.
- In CSI: Miami, it is eventually discovered that a woman died because her handler ignored her coded call for help.
- Employed several times in 24, the most famous instance being early in Day 5, when Jack Bauer is being forced to misdirect CTU's assault teams into an ambush by the terrorists. He slips the duress code "flank two" into his radio conversations, but CTU initially fails to pick up on it, since their duress codes have been changed in the two years since they fired Bauer.
- During a con in Leverage, Nate and Sixth Ranger Tara are held at gunpoint by a Corrupt Corporate Executive and Triads who demand $50,000. Tara tells Nate to get the fifty thousand: "Fifty thousand, ok, five-o, do you understand, five-o?" The "five-o" is an explicit covert alert for Nate to switch the con they had been running to one that involves bringing in the police.
- In Terra Nova, Cowboy Cop Jim Shannon teaches his family this trick, which comes in handy when his daughter Maddy is kidnapped by a murderer.
- In "Bête Noire", Ducky and his assistant Gerald are held hostage in Autopsy. Ari, the hostage taker, needs evidence that is now in Abby's lab. So, while on speaker phone, Ducky yells at Abby he needs the evidence back "stat." "Stat," as Gibbs and others later note, is code for a medical emergency requiring immediate help. As the "patients" in autopsy are typically dead, Gibbs realizes there is a lot more going down.
- Played with in the episode "Judgment Day." Director Shepard dismisses Tony and Ziva (her security escorts) before going on a dangerous mission. When they call to check up on her, she doesn't use the duress word, so Tony thinks she's OK while Ziva is still concerned. They later find her in an abandoned diner, having been shot and killed.
- A troubled young man takes hostages and demand to see his mother. The off-site agents find out that said mother is listed as "deceased". In order to get this information to the on-site agents, they give the name of one of their now-deceased agent as the one who is handling the case.
- Buffy the Vampire Slayer. In "First Date", Xander text messages Willow a codeword that means either "My date is a demon who's trying to kill me - send help!" or "Don't call me because I'm about to score!" Unfortunately as it's been several years since Xander went on a date, Willow has forgotten which one it is. They play the percentages and rescue him.
- Angel. Angel Investigations doesn't have one, so when Lorne is held captive in Las Vegas, he keeps asking about 'Fluffy' (a non-existent dog) when calling his friends. Unfortunately one of Lorne's character tropes is The Nicknamer, so no-one is suspicious.
Winifred: You don't think he was referring to anything of mine that's fluffy, do you? Because that would just be inappropriate.
- Doctor Who
Doctor: I assure you, Brigadier, there's nothing to worry about. Tell Styles that. Tell the Prime Minister. And, Brigadier, be particularly sure to tell it to the Marines.
- In "Warriors Gate", experienced companion Romana does a tongue-in-cheek version where she tells new companion Adric that the signal is her putting her hands up. She is later invited by the villains back to their spaceship; aware it's a trap, she does an elaborate gesture that just happens to involve putting her hands over her head.
- In "Day of the Daleks", the Doctor uses contemporary slang that the soldiers holding him prisoner don't understand, as they've time-travelled from the future.
- Wiseguy. Undercover cop Vinnie Terranova calls his Uncle Mike (actually 'Lifeguard', his Mission Control) and says he can't make breakfast. At one point he's arrested by the local police and has to shout to the woman with him as he's dragged off to relay the message. She does, but knows there's something suspicious as she's Vinnie's cousin, and he doesn't have an uncle called Mike.
- Sherlock has one between Sherlock and John: "Vatican cameos." The second time it's used, John explains that it means "battle stations, someone's going to die."
- Supernatural. In "Hunted", Gordon has captured Dean and gets him to call Sam to their location. Dean tips him off via this method (the codeword is "Funkytown"), but Gordon is savvy enough to anticipate this and rig the back door with a Booby Trap for when Sam tries to sneak up on him.
- Enemy at the Door is set in German-occupied territory during World War II. In "Call of the Dead", a character who's been sent to a German-run prison writes home to his family assuring them that things are going well for him, and marks off the bit that's actually true from the rest that's lies because he wouldn't be allowed to tell the truth with a mention of a non-existant friend named Betty Martin, a reference to the expression "all my eye and Betty Martin".
- The Bill. The detectives arrest an Eastern European drug dealer and force him to set up a drug buy. They insist he speak English while making the call to avert this trope, but when no-one shows up the dealer smugly points out that they never speak English while making a deal in case they're overheard, so this trope happened anyway.
- Modesty Blaise: If Modesty or Willy insert the name 'Jacqueline' into a conversation, the other knows that they are under duress and not able to speak freely.
- The List of Character Survival Techniques Version 1.5, as a guide to RPG players, includes the following tip:
The party should have a short list of subtle signs, with meanings like:"Something is wrong, try to leave unobtrusively.""Get ready for a fight.""Get ready to run like hell."
- The Halo novels established the Spartan-IIs' classified distress call as a simple "Olly Olly Oxen Free". It makes a rather ironic reappearance in Halo 5: Guardians.
- In Mass Effect, Quarians returning to the Migrant Fleet have a code phrase that indicates they're in danger. It's a sign of how loyal Quarians are that they know full well that giving the duress code signals security to fire on their ship. They also have a second phrase that indicates their mission was successful and the ship they're aboard is no danger to the Fleet; Tali'Zorah's is "After time adrift among open stars, along tides of light and shoals of dust, I will return to where I began."
- A major plot point in New Captain Scarlet episode "Trap For A Rhino". The Mysterons are actually counting on a kidnapped Spectrum agent using her duress code so they can ambush the rescue team and hijack the titular Rhino armoured vehicle, which they intend to use to blow up a nearby nuclear power station.
- According to some newspaper stories, Queen Elizabeth II of the U.K. apparently has several signals involving the way she holds her handbag which she uses to signal her staff when she wants to get out of a conversation with someone (for example).
- Also during World War II, the British government had spies working in occupied Europe, and gave them codes to indicate if they had been captured by the Germans and forced to send bogus data back. Unfortunately, several captured operators would use the code, then their British handlers would say "that's your duress code, don't use it unless you've been captured", and the spies got shot by the Germans. Strangely, the German intelligence services never seemed to have thought of doing the same with their own agents, all of whom were captured within hours of being landed in Britain and being offered a choice between turning and death.
- Notably, the hapless (and other) British operatives actually used an inverted form of this - they were given certain codes to include in their messages as long as they were free, but deliberately leave out of their messages if they'd been captured. This makes their handlers' mistake slightly more forgivable - one lapse could technically have been an oversight on the agent's part - but still, SOE headquarters seemed to routinely assume their agents were forgetful, rather than compromised.
- In a similar vein, an Australian agent sent to East Timor hadn't been issued a distress code, so one was transmitted to him. Problem was, he'd already been captured by the Japanese. Another agent carelessly wrote down his code in his logbook, but was able to convince his captors the word was innocuous... until his handlers in Australia transmitted the word three times in the same message to 'remind' him that he'd left it out.
- When Norway was under Nazi occupation during World War II, resistance workers wore paper clips on their shirt pockets to identify each other. It didn't take long, however, for the occupiers to eventually notice.
- Flying a national flag upside down is sometimes said to be one of these, but in fact it's considered an Overt Distress Code; it's a recognised form of Distress Call for ships at sea with non-functional radios. For flags where it's not immediately obvious they're being flown upside down you're supposed to tie a knot in them.
- Before the Iraq War, a soldier let his family know he was about to go into combat by inserting a phrase about the size of the flies into a message to them- which they had pre-determined before he deployed.
- Commonplace in retail security, often with a variety of code-phrases ranging from "observe potential shoplifter in [area]" to "send in-house security" to "call law enforcement" to "missing child in the store."
- Aircraft transponder code 7500 is reserved for use in case of hijacking (a handful of other codes are reserved for other emergency situations). note
- Hospitals often have a specific phrase that they use when they need security, but don't want a panic, or for a violent person to know that security is on the way - such as "Paging Doctor Silver to (nearby room)".
- Parents will often set up one of these with their children, so they know when the child needs rescuing from an uncomfortable situation but doesn't want to embarrass themselves in front of friends/peers.