->''"Sign, sign, everywhere a sign\\
Blockin' out the scenery, breakin' my mind\\
Do this, don't do that\\
Can't you read the sign?"''
-->-- '''Five Man Electrical Band''', "[[https://www.youtube.com/watch?v=uYsBDmqJfjQ Signs]]"

%%One quote is enough, please put further ones in the quote tab.

A humorous trope in which a [[TheTapeKnewYouWouldSayThat posted sign or spoken warning against an action is so precise]] that you just know that the characters will do exactly that, or just have.

Not to be mistaken for SchmuckBait, where the sign is the source of temptation. Instead, this trope forbids something that the characters were going to do anyway, or [[NowYouTellMe didn't realize was forbidden]]; often they take no notice of the sign.

Compare NotCheatingUnlessYouGetCaught and RulesOfTheRoad. Also see [[AskAStupidQuestion Here's Your Sign]], when the humor comes from the stupid things people say ''about'' the sign.



* A commercial for Corn Pops has a sign at a zoo reading "Do Not Mesmerize Lizard With Delicious Corn Pops."

[[folder:Anime & Manga]]
* A favorite gag in ''Manga/RanmaOneHalf'':
** In one instance, there is a sign saying "Do Not Break Wall". Ryōga breaks it.
** Early in the anime, Ryōga falls down a hill next to a sign reading "Warning: Landslide area".
** In the manga, Ryōga, thinking of Akane, hugs a pole that has the notice "Do Not Hug Pole". Because he's so strong, he breaks the pole. And right above the former sign there is another, off-panel in the previous panel, which reads "Do Not Break Pole".
** An exhausted Ryōga is so desperate he asks a ''horse'' for directions. Naturally, there's a nearby sign that reads, "Do not talk to horse."
** Ranma's mom sits on a water main marked "Danger: Do Not Sit".
** Pantyhose Taro is dangled from a tree with a sign on it reading: "Please do not hang people from this tree."
** Sōun and Genma are once knocked off a cliff by a sign blown at them by very strong winds. The sign reads: "Danger! High Winds!"
** Ranma is once running atop a the fence by the canal (as he does all the time), when a section falls out, marked with a sign that reads "Danger: Unstable. Do not stand on top." He quickly jumps onto the next section... which read "Also unstable" and dumps him into the water.
** One of the more humorous examples has a one-shot character waiting for Kodachi at a garden while doing a NoblewomansLaugh. Naturally, there is a sign right outside that says "Please do not laugh loudly inside the garden."
** Ryū Kumon, while training with his RazorWind technique, cut into pieces a Bhudda statue bearing the sign "Please don't cut the Bhudda statue into pieces". Later, the statue had been pieced together (with adhesive tape) and sports a new sign: "Please don't cut the Bhudda statue into pieces again". Naturally, Ryū does so while fighting Ranma (and the statue's head is ''crying'').
** Needless to say, Creator/RumikoTakahashi loves this gag, and it appears several more times.
* ''LightNovel/HaruhiSuzumiya'' never met a sign she didn't [[GenkiGirl promptly]] [[JerkAss ignore]], such as the NO DIVING sign during the pool scene in "Endless Eight", while Kyon has never missed a sign that he didn't suffer for. At least, not yet. R.I.P., Kyon's Bike.
* At one point in ''Manga/{{Yotsuba}}'', Yotsuba leans over the arm of an escalator... [[LaserGuidedKarma and hits her head on a sign warning not to do just that.]]
* The ubiquitous, not-once-respected "NoSmoking" signs from ''Anime/CowboyBebop''. One of them is even written ''in German''.
* A running gag in the early episodes of ''VisualNovel/SteinsGate'' is Okabe using his cellphone while sitting in front of a "No Cellphones" sign. Made all the funnier in that he's only pretending to use his phone, but is always chewed out for it nonetheless.
* One episode of ''Manga/YoureUnderArrest'' has local VigilanteMan Strike Man getting angry at a bunch of cars parked right in front of a "No Parking" sign. [[ParkingPayback He proceeds to deflate their tires as punishment]].

* Overweight comedian Bruce Bruce has a bit involving him and his similarly heavy cousin going to all-you-can-eat restaurants and sitting down at the buffet itself to eat, using "Well, I don't see a sign!" as their defense when approached by the staff. He mentions that when they get up to go to the bathroom, the restaurant usually puts out a sign.
* A sketch by ''Series/TheTwoRonnies'' includes a sign saying "Do Not Throw Stones at This Notice".

[[folder:Comic Books]]
* Creator/PhilFoglio is fond of these as [[FunnyBackgroundEvent background jokes]] in his various comics. As an example, in a MadScientist's lab in ''ComicBook/XXXenophile'', there was a sign on a complex piece of electrical equipment reading, "Do Not Place Tongue Here. Again".
%%* [[http://coa.inducks.org/story.php?c=BC+ZC+2316 No Leaning on the Sign]]
* A one-panel scene in ''[[ComicBook/ScottPilgrim Scott Pilgrim's Precious Little Life]]'' shows him sitting on a couch, right next to a sign that says "Do Not Sit". TheMovie reproduced the scene as well (Director Edgar Wright states in the commentary that he thought it was one of Brian Lee O'Malley's best jokes).
* Played for laughs in a WesternAnimation/DonaldDuck story. He and his nephews go to a foreign country and the nephews climb a wall. On the other side of the wall, a furious man calls their attention to a sign at the top of the wall and asks if they can't read it. As the sign is written in the country's language instead of one they knew, the nephew who answers truthfully says "no". (The wall is so high nobody would be able to read the sign without climbing it first.)
* In one Franchise/ArchieComics episode, "A Symbol Problem", Veronica goes to Norway. But everywhere she turns (and whatever she does), she always meets up with a guard who points to a sign which prohibits something she has done. Fed up with everything, she finally decides to show everyone what the place is really like, and changes the sign to say, "Welcome to NO WAY".
* ''[[ComicBook/TheMask The Mask Returns]]'' once shows Big Head revealing a bomb (that he himself pulled out from {{Hammerspace}}, no less) with the text "Warning: Do not strike with hammer" on it. Guess what he does.

[[folder:Comic Strips]]
* ''ComicStrip/{{Nodwick}}'':
** [[http://nodwick.humor.gamespy.com/gamespyarchive/index.php?date=2008-03-10 Done with a]] SwordInTheStone.
** [[http://nodwick.humor.gamespy.com/nodwick/dragon/nodwick06.html Also]]:
--->'''Nodwick:''' What part of ''"Open ye not the portal to my tomb lest I pour out my undying wrath"'' did you ''not'' understand?\\
'''Yeagar:''' I thought it was just a bluff to keep the tourists out.
* ''ComicStrip/TheFarSide'' did this a few times:
-->"Do Not Give the Birds Dutch Rubs"\\
"Keep Off the Dog"\\
"No Projectile Vomiting"
* ''ComicStrip/{{BC}}'':
** One strip has a character see a sign that says "Do not stand in front of sign". He tries to walk past it, but the other side says "Do not stand behind sign". The last panel shows him standing on ''top'' of the sign, a helpless expression on his face.
** The same character, standing and staring at a sign, implicitly for quite a while. When someone comes along, he asks them, "Hey, what does 'loitering' mean?"
** Other signs have included "DO NOT EAT THIS SIGN" (Grog ate the pole and spat out the sign) and "DO NOT STAND ON THIS SIGN" (cue rebellious caveman standing on it, despite gravity being 90 degrees from the position he was in)
* In ''ComicStrip/BloomCounty'', signs reading "No toad sexing" or other strange restrictions could occasionally be spotted in the background. A visitor to MIT will find the words "No toad sexing" scrawled on the walls in numerous out-of-the-way places. The exact origin of this is disputed.
* The ''ComicStrip/USAcres'' strip [[http://www.platypuscomix.net/otherpeople2/usacres4.html used it]] [[http://www.platypuscomix.net/otherpeople2/usacres5.html quite a bit]] (in the first link, starts near the bottom).
* A strip by Creator/{{Quino}} shows a man blatantly disregarding a "No smoking" sign. LaserGuidedKarma ensues, and it currently provides the image to CantGetAwayWithNuthin.

[[folder:Films -- Animation]]
* ''Disney/LadyAndTheTramp'' features a scene where Lady, after getting muzzled after a clash with mean Aunt Sarah's two Siamese cats, is taken by the Tramp to a zoo where he knows a beaver that will help him get the muzzle off. There is a sign that says "No Dogs Allowed" at the entrance of the zoo. The Tramp gets around this by inciting a fight between the guard and a visitor, allowing him and Lady to enter the zoo undetected.
* ''Disney/TheEmperorsNewGroove'' has a "No Llamas" (a llama with a line through it) sign at the diner.
* ''Anime/PomPoko'' has a scene where trash is dumped in the woods near a "no littering" sign.
* ''WesternAnimation/BatmanAndHarleyQuinn'': Harley Quinn works as a waitress in [[FanserviceWithASmile Superbabes]]. A customer tries to grope Harley and she breaks his arm. When he complains about it, a cook points at a sign that reads, "Look All You Want, But Don't Touch The Girls".

[[folder:Films -- Live-Action]]
* ''Film/{{Spaceballs}}'':
** The [[SelfDestructMechanism auto destruct button]] has a sign warning not to press it. Also doubles as SchmuckBait.
** At the start of Lone Star's rescue of Princess Vespa, a group of Spaceballs object to him parking his Ship outside the detention block. "Hey! You can't park here!" "Yeah! Can't you guys read? No parking!" The heroes proceed to ignore the demand.
* ''Film/NotAnotherTeenMovie'':
** A sign on the ventilation duct work states: "Limit Two Horny Teenage Boys". When three try to use it, it breaks.
** When we first see [[MsFanservice Areola]], she's standing naked in a school hallway next to a sign that says "Dress Code Strictly Enforced".
* The guitar store in ''Film/WaynesWorld'' has the sign "NO Stairway to Heaven". This sign is [[TruthInTelevision based off the real world]]: so many people would come into music shops and test the guitars by playing "Stairway to Heaven" that clerks would hang those signs[[note]]Some guitar shops have a sign warning against playing "Smoke On The Water" - the chord sequence for the opening [[https://www.youtube.com/watch?v=iWl0YJN5Xf4 can be transposed to power chords]], making it so simple that almost anyone can thrash it out, but that's no excuse for inflicting it on the poor sales staff yet again. Seriously, don't do that[[/note]]. In the original theatrical release, Wayne ''did'' play Zeppelin's classic, but on home video releases, due to music licensing issues, it's a SuspiciouslySimilarSong. If anything, that makes it even funnier. "No Stairway! Denied!"
* ''[[Film/LaCiteDeLaPeur La Cité de la peur]]'':
** This French movie starts with a [[StylisticSuck very poor]] [[SlasherMovie slasher film]] in which a hammer-and-sickle-wielding killer is thrown into a puddle of oil fuel. Next to said puddle is a sign saying "OIL FUEL. DO NOT JUMP IN THERE". When the killer is thrown in the puddle ''again'', the sign now says "OIL FUEL. DO NOT RE-JUMP IN THERE".
** "Choucroute interdite" ("Sauerkraut forbidden")
* A classic example is the scene in ''Film/TheWizardOfOz'' when Dorothy and the others arrive at Emerald City. After ringing the bell, the doorman tells them "Can't you read the sign?" He then realizes he had forgotten to put up the sign which reads "Bell out of order. Please knock." It is also evidently the {{Trope Namer|s}}.
* In the park in which the Burly Brawl in ''Film/TheMatrixReloaded'' takes place, [[DevelopmentGag a posted sign reads "No Brawling"]]. Neo rips the sign out of the ground and clobbers a Smith with it.
* ''Film/ScaryMovie'' begins with a woman running away from the killer. She reaches a sign which points in two directions, one "Safety", the other "Death". [[TooDumbToLive Guess which one she picks.]]
* In ''[[Series/ThePhilSilversShow Sgt. Bilko]]'', we get Bilko sitting behind his desk in the motor pool, in front of a huge no smoking sign. "We have rules!" (lights match on sign) "Rules and regulations!" (lights cigar with match, takes puff)
* ''Film/BedknobsAndBroomsticks'' features a hapless bear who catches the magical bed while fishing, and tries to throw Miss Price and company back into the sea because "Can't you read reading? No Peopling Allowed!"
* Ashley in ''Film/JustMyLuck'' tries to sit down at a restaurant and get a glass of water, but the FunnyForeigner manager tells her [[YouNoTakeCandle "No buy no sit!"]], then points out a sign that actually ''does'' use those exact words.
* In ''Film/AirplaneIITheSequel'', there is a sign on some fuel barrels saying "Flammable. No Smoking. No Spitting." One character lights a cigarette and throws the match at the barrels -- nothing happens. Another character spits at the barrels, causing a huge explosion.
* ''Film/MaxKeeblesBigMove'' played on this a bit: When Megan meets Jenna for the first time, Jenna tells her that the seat she's sitting in actually belongs to her. Megan asks if it has her name on it or something, to which Jenna reveals that the seat does have her name on it.
* Subject of a gag in ''Film/Gremlins2TheNewBatch'', in which a beaker in a laboratory is labeled "ACID: DO NOT THROW IN FACE". Rather unsurprisingly, a Gremlin chooses to ignore this dictate.
* In ''Film/TheHotChick'' there's two instances of this. When Jessica (in Clive's body) starts strangling Clive (in Jessica's body) the owner of the strip club comes to point at a neon sign that reads "No strangling the dancers". Later on, when Clive returns to his body and tries to run out of the club (because he still has the stripper outfit), the same owner points to another sign: "Monday night is Gay night".
* ''Film/TheWagesOfFear'': The characters keep smoking next to a truck full of nitroglycerin, with a sign that says "No flame within 50 feet." Not used for comedy so much as to display the characters disregard for their own safety.
* In ''A Stranger Among Us'', FairCop Emily Eden is seen having a CigaretteOfAnxiety right underneath a huge "No Smoking" sign while she waits for word on her injured partner.
* ''Film/ScottPilgrimVsTheWorld'': In addition to the "Do Not Sit" joke under Comics, every time we see Scott's sister on the phone, she's doing so under a sign that declares [[HypocriticalHumor customers who are on their phones will be ignored]].

* ''Literature/{{Discworld}}'':
** As in ''Wayne's World'', played with in the novel ''Discworld/SoulMusic'', although there's no sign in Blert Wheedon's guitar shop; the "warning" that you shouldn't play "Pathway to Paradise" is when a troll rips your arms off.
** Used as a weapon in ''Discworld/ThiefOfTime'' against powerful beings called the Auditors. Since the Auditors follow "laws" and are actually the ones who file the paperwork for them, they obviously must respect what the sign says. When the signs in question are nonsensical, like [[LogicBomb an arrow pointing left that says "KEEP RIGHT"...]] And when presented with a sign prohibiting the feeding of ''the'' elephant -- the Auditors are compelled to seek out an elephant to ''not'' feed.
--->'''[[AC:Ignore this sign. By order.]]'''
** It's also occasionally referenced that an AM citizen/Wizard, upon encountering a sign not to perform an action will immediately perform the action just to see what all the fuss is about.
** And indeed that if there was a big lever in a hidden cave somewhere with a sign next to it saying "END OF THE WORLD SWITCH. DO NOT TOUCH." the paint wouldn't even have time to dry.
* Also crops up in the ''Nomes/Bromeliad Trilogy'', although in this case the nomes don't understanding the signs (or indeed a lot of other parts of our world).
* Creator/TomHolt's book ''Who's Afraid of Beowulf?'' has some Vikings encountering the many signs on the London Underground escalators, and are almost stumped by the one saying "Dogs must be carried". Thankfully, they have a {{shapeshift|ing}}er.
* Polish book ''Krzyżacki Poker'' (in English it would be ''Teutonic Poker'', as in Teutonic Knights Order) utilises this on the cover -- we see character smoking right under sign "Rauchen Verboten" ("No Smoking" in German).
* In the ''[[Literature/TheKingkillerChronicle Kingkiller Chronicle]]'' series, taverns near the [[WizardingSchool Arcanum]] have signs reading "No Sympathy" where "Sympathy" is a form of FunctionalMagic. Kvothe points out that these signs are [[NoSympathy likely confusing]] to [[{{Muggles}} persons unfamiliar with magic.]]
* Andy Griffiths' ''Just!'' series:
** A hilarious inversion in ''Just Annoying!'' Andy takes one of his neighbor's garden gnomes on holiday and sets it up for a photograph (for a postcard) on the diving board at the swimming pool. The lifeguard catches him and tells him that garden gnomes are banned from the pool. When Andy correctly points out that this is not on the sign (which he even checked beforehand), the response is "It shouldn't have to be, it should be obvious."
** ''Just Stupid!'' has a running gag where a park-keeper points out signs ("Keep off the Garden", "No Swimming") shortly after Andy has broken the rule in question, which eventually drives him to try and chase Andy out of the park. Andy's attempts at LoopholeAbuse do not help: "I look around to check there's no signs saying 'No Scooping'. No, only one that says 'No Fishing'." Or more brazenly, "As far as I can see there is no sign around here saying 'Do Not Dismantle the "No Fishing" Sign and Turn It Into a Scoop'."
* In one of Creator/JohnBellairs's [[Literature/TheTreasureOfAlpheusWinterborn Anthony Monday books]], Miss Eells blatantly ignores a "No Trespassing" sign as she and Anthony hop a fence to explore an empty house. The narrator notes that Miss Eells hates such signs anyway, and once stomped on one just to show what she thought of it.
* "In Ambush" from ''Literature/StalkyAndCo'' by Creator/RudyardKipling has [[RetiredBadass Colonel Dabney]], who walled his territory with a fence with lots of notice-boards such as "''Prosecuted with the utmost rigour of the law. G. M. Dabney, Col., J.P.,'' an' all the rest of it." -- and jaws the land and sea out of everyone who fails to keep out.
-->'''Colonel Dabney:''' You saw my notice-boards? Must have. Don't attempt to deny it. Ye did! Damnable, oh damnable!
* A Sweet Pickles Book called "Xerus Won't Allow It" has the titular creature (a relative of the squirrel family) posting signs in an attempt to bring order in the town where she lived at.

[[folder:Live-Action TV]]
* In one skit on ''Series/AllThat'', the actors admonished a studio audience member for bringing a sheep into the studio. He protested, saying "I didn't see a sign!" At that point they indicate a large "NO SHEEP" sign on the wall.
** And then there's the [[HypocriticalHumor Noisy]] [[ExactlyWhatItSaysOnTheTin Librarian]] sketches...
* Earl of ''Series/MyNameIsEarl'' is asked to make a shiv while in prison. He examines an array of improvised knives on glass display, with a sign saying "Don't make any of these".
* Punningly parodied in the 1960s British sketch show ''Series/WeHaveWaysOfMakingYouLaugh''. Two villains are about to throw their captive into an incinerator, until he notices a sign which reads "Refuse to be placed in incinerator", and does so.
* ''Series/TopGear'' once had a miniature campaign regarding unnecessary road signs. Among the first pictures shown was a car which had crashed into a sign reading: "Thank you for driving carefully through our village". Clarkson then points out that if the sign weren't there, the car wouldn't have hit anything.
* ''Series/BuffyTheVampireSlayer'':
** In an episode, Spike lights up a cigarette while framed by a "No Smoking" sign. In a hospital, no less. Harmony, however, looks embarrassed and snuffs hers out when the sign is pointed out to her.
** In "Hush", after everyone is struck mute, Riley and Forest take the elevator down to the Initiative, but can't provide the voice ID and the elevator starts to fill with deadly gas. They're rescued before they asphyxiate, and after letting them out, Professor Walsh points out the sign that reads "In case of emergency, use stairs".
** Also used for ominous {{foreshadowing}} -- at the end of "The Harvest" Angel appears to be standing next to a sign saying WATCH YOU -- appropriate enough for his MysteriousWatcher role. But when he walks away we see the sign actually reads WATCH YOUR STEP, foretelling his FaceHeelTurn into Angelus.
** Similarly, at the end of "After Life" when Buffy confides in Spike, he's standing next to a discarded door with a BEWARE OF DOG sign -- a RunningGag with Spike, but this time hinting at the DestructiveRomance to follow.
** And in an episode that addresses the destructive nature of Buffy's RomanticVampireBoy attraction, there's a road safety poster saying ''Most Women Aren't Attracted To Dead Guys''.
** Shortly after Faith is introduced and doing a tour of the school she stands in front of a poster, ''Campus Rape Starts Here.'' It's meant to be a warning on spiking drinks but depending on how you count them Faith would end up a multiple rapist.
* In the first episode of ''Music/FlightOfTheConchords'', Sally breaks up with Jermaine in front of a sign that says "No Dumping".
* One of the common bits on ''Series/TriggerHappyTV'' was Dom Joly standing in front of an enormous picture of himself labeled 'DO NOT TRUST THIS MAN' and talking to people, giving them directions and such.
* In an episode of ''Series/CornerGas'', Lacey tells Karen not to play with her hackey sack in the restaurant. Karen says that if it's a rule, there should be a sign posted, to which Lacey replies "We don't have a sign for everything. Read the sign!" and then points to a sign that reads "We don't have a sign for everything. -- Lacey".
* ''Series/HomeImprovement'':
** In an episode, Tim Taylor and Jill Taylor decided to each test-drive a tank, and Tim manages to plow several things over, including a sign that said "Tank Crossing" that was conveniently right in his path.
** When the ''Tool Time'' crew visited an aircraft carrier, a large sign on the deck was modified to read, "Beware of jet blast, propellers and Tim."
* In the ''Series/{{Monk}}'' episode "Mr. Monk and Little Monk", Monk and Natalie had to stake out at a biker bar to identify the patrons who killed Gladys, the housekeeper of an old friend of Monk's. Monk attempts to tell a biker at the bar that he shouldn't be smoking and points to a no smoking sign right above the biker. Not only did the biker not stop smoking, but the biker simply reached up for the sign and set it on fire.
* In a flashback on ''Series/{{Highlander}}'', Duncan and Fitz have an argument and drew their swords. A guard yells at them, "There's no dueling in the city! Can't you read the sign?" In the next flashback segment, it's revealed that at the time, neither man could read.
* In an episode of ''Series/HowIMetYourMother'', Barney is trying to get Marshall from Atlantic City to New York, and steals a motorcycle off a display in the middle of a casino. Since he hadn't yet driven out of the building, when the security guards take him to wait for the police, he challenges them to show him the rule that says you can't drive a motorcycle in the casino. The guard smirks and pulls over a book of casino rules. JumpCut to the guard slamming the book closed and saying, "He's right, let him go." Immediately afterwards another guard is hanging a sign, "No Motorcycle Riding on Casino Floor".
* A ''Series/{{MASH}}'' episode opens with Hawkeye driving a jeep with Frank Burns, who orders him to "stop right here!" Cut to them pulling up at a sign reading, "DON'T STOP HERE -- YOU'RE UNDER DIRECT ENEMY VISION!!" (Frank then jumps out to snap a picture of the sign, instantly drawing sniper fire.)
* ''Series/{{Supernatural}}'':
** In the episode "[[Recap/SupernaturalS02E19FolsomPrisonBlues Folsom Prison Blues]]", there are numerous signs posted saying that fighting by inmates will not be tolerated, but the episode is full of GoodOldFisticuffs.
** In "My Heart Will Go On", Fate is trying to kill the Winchesters with freak accidents. As the brothers walk nervously along the street, they're alarmed by skateboarders zooming past them, pedestrians walking large dogs, and street performers juggling sharp objects, despite a sign forbidding all of these activities.
** In "A Little Slice of Kevin", Crowley tortures Kevin Tran by cutting off a finger. We then cut to our heroes passing a sign saying, "Beware: Sharp Edges Keep Fingers Clear".
* ''Series/{{Community}}'': Jeff takes Beginner Pottery, an "ultimate blow-off class", then sets off Professor Holly's BerserkButton by inadvertently re-enacting the pottery scene in ''Movies/{{Ghost}}''. Holly growls "One rule I asked you to follow. One. LOOK!" and points to a poster of Patrick Swayze with an "X" over it.
-->'''Holly:''' I had it made before he died. It's not in bad taste.
* ''Series/TheGoodies'': In "Holidays", Bill pulls down a list of ridiculously strict rules on the wall of their holiday chalet. Underneath is a sign saying '250 pound penalty for removal of notice'. Bill hurriedly sticks it back.
* ''Series/DoctorWho'':
** In "Time Heist", all the air vents have the warning "No Entry Under Any Circumstances". Given that AirVentEscape is a RunningGag in the series, let alone this episode, it's universally ignored.
** In "The Caretaker", the Doctor complains of the SnoopingLittleKid who ignored his Keep Out sign. She points out that it actually reads "GO AWAY HUMANS", which while still pertinent is a bit harder to take seriously.
** Inverted in the Classic episode "Spearhead from Space", in which the Third Doctor is recovering from regeneration in a British hospital. He sneaks out of his room in a hospital gown, seeking clothes and to hide from his (very perplexed) physician; spotting a door marked "Doctors Only", he (being ''the'' Doctor) walks right in.
* ''Series/TorchwoodChildrenOfEarth''. Gwen pistol-whips a (fake) ambulance officer, next to a poster warning of the legal consequences of assaulting ambulance officers.
* In a sketch on ''Series/TheBennyHillShow'', Benny plays a worker putting up assorted signs. One of the signs says "Post No Bills." A policeman comes along and sees him posting the Post No Bills sign and tickets him for posting the sign.
* A Christmas episode from ''Series/SwiftandShiftCouriers'' has Mario being told to stop by the Traffic Controller, which causes a fight between them. Later that same episode, Amanda nearly killed the traffic controller while drunk.
* One episode of ''Series/BigTimeRush'' has the nasty hotel manager putting up a sign to prevent children from swimming: "Adult Swim. No kids allowed." Kendall takes out a marker and adds some creative punctuation: "Adult Swim? No! Kids allowed!" Everyone proceeds to jump in.

[[folder:Music Videos]]
* In the quasi-patriotic video-clip for the Dutch song "Vijftien Miljoen Mensen", the iconic image is a picture of a "Do Not Walk on the Grass" sign behind which are dozens upon dozens of people walking, talking, picnicking and doing other assorted things on the grass.
* In a Music/MichaelJackson film, a cop turns up to tell Jackson off from Moonwalking, pointing to the no moonwalking sign.

[[folder:Puppet Shows]]
* The ''Series/SesameStreet'' special "Don't Eat the Pictures" features one of these in the Metropolitan Museum of Art. Guess what it says. (This was in fact a real sign that was in the museum at the time.) ExtremeOmnivore Cookie Monster find this difficult.
->'''Cookie Monster:''' This going to be long night.

[[folder:Video Games]]
* In ''VideoGame/Portal2'', a sign in 1950s Aperture warns you not to fall down an elevator shaft. Sure enough, the only way to proceed is to fling yourself by falling down the elevator shaft.
* In ''VideoGame/TheLegendOfKyrandia Book 3: Malcolm's Revenge'', one section involves navigating sheer-faced cliffs and waterfalls, and the only way to go is up or down with the aid of certain items. There are signs posted on each screen that inform what items are not allowed ("No climbing shoes", "No [[ParasolParachute umbrellas]]", etc.) However, it's reverse psychology. The forbidden items are the items that will ''work''.
** FridgeBrilliance: You ARE playing as a villain....
* ''Franchise/TheLegendOfZelda'': In any ''Zelda'' game, ignoring odd signs is considered wise.
** The treasure chest and fishing minigames in ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' are hinted to have banned items; these items can be acquired and used to your advantage. (However, in the case of the sinking fishing lure, you do get a notice on your catch saying it was caught with an illegal lure.) But in that case, you ''can'' make it legal.
** ''VideoGame/TheLegendOfZeldaALinkToThePast'':
*** The game has a signpost warning people not to throw objects into an obvious circle of stones sitting nearby. Not only is doing so the only way to get an item required to beat the game, but in this game, ''signposts themselves'' can be lifted, making it far too tempting to obtain the item by throwing the signpost.
*** There's another sign that warns you to pay no attention to the man standing next to it. If you go up and talk to the man, he's silent. But if you steal his sign, he gets a bit annoyed and starts following you around....
* ''VideoGame/PokemonRedAndBlue''. "Don't touch the poster in the Game Corner. [[SuspiciouslySpecificDenial There's no secret switch behind it!]]"
* In ''VideoGame/{{Madworld}}'', you can impale a {{mook|s}} in the head with a sign. Guess what the sign warns you about? There are other signs posted near a ledge warning about the deep water below, almost daring you to throw enemies in.
* In the first ''VideoGame/{{Oddworld}}'' game, inside Rapture Farms, there are various signs of this kind. For instance, near the beginning, "NO TALKING! To fellow employees", referring to the game mechanics of Gamespeak. Indeed, if the player DOES try to talk to one of his fellow employees who is next to a Slig, and the employee responds, the Slig will shoot and kill him. Obviously, Rupture Farms takes their no-talking policy very seriously.
* ''VideoGame/EarthBound'':
** You are warned of in one cave about "Falling Objects". Then the photographer drops from the ceiling to take a picture of you. Granted, he always drops from the ceiling.
** In a similar light, after visiting the Giant Step, Captain Strong stops you on the way out because of the DO NOT ENTER sign outside the shack (the letters are big enough for the ''player'' to read). You have to then go to the Police Office to wrap that issue up and proceed to Twoson. Yes, this is part of the plot.
* ''VideoGame/Mother3'':
** A sign obstructing the scenery warns you not to obstruct the scenery by posting signs.
** After the TimeSkip, a sign beyond a flowerbed begins to admonish you for stepping on the flowers in order to read it, [[SubvertedTrope before conceding that it's really the fault of whoever put the sign up in the first place.]]
* In ''VideoGame/DonkeyKongCountry2DiddysKongQuest'', signs are used to indicate where animal friend sections end. Trying to cross the sign while riding one (or assuming the form of one) will cause the poor creature to inexplicably disappear and provide an extra life balloon.
* The online promotional materials for ''VideoGame/PrinnyCanIReallyBeTheHero'' include [[http://www.prinnies.com/blog/?p=189 this video]]. Sorry, no Prinny allowed!
* Parodied in ''[[VideoGame/LunarTheSilverStar Lunar: Silver Star Story Complete]]''. In Meribia, there's a sign on one house that's blocked by a bunch of flowers, making it impossible for anyone in your team to read. After Kyle joins the team, you can bring him to examine the blocked sign. Kyle resolves to find out what the sign says by walking through the flowers and destroying them. So what does the sign say? "Please don't step on the flowers."
* ''Franchise/MetalGear''
** Any time Snake smokes in ''VideoGame/MetalGearSolid4GunsOfThePatriots'' there is a "no smoking" sign behind him.
** Not the only time Snake could invoke this trope: In ''VideoGame/MetalGearSolidTheTwinSnakes'', some of the armory's rooms have the words "No Smoking" in big letters, and if you equip the cigarettes... well, it speaks for itself.
** May have also been in ''VideoGame/MetalGearSolid''.
* In the No Mercy campaign of ''VideoGame/Left4Dead'', Bill sees a No Smoking sign and retorts with "That's a crock of shit!"
* ''VideoGame/FullThrottle'' plays with it. "Do not play in or around Dumpster, do not sleep in Dumpster, do not Kick Dumpster, Usage of this container for disposal of human remains in this container may violate health ordinances". Ben observes this after [[TapOnTheHead taking a nap in the dumpster,]] [[DeadMansChest being disposed of in the dumpster,]] [[OpenSaysMe playing around in the dumpster,]] and kicking the dumpster.
* ''VideoGame/RevolutionX'' has this, in which Helga writes a bunch of "do nots" on a chalkboard, these include stuff like, "Do not open secret areas", "Do not collect powerups", etc.
* ''VideoGame/SamAndMaxFreelancePolice'':
** In ''Sam and Max Save the World'', there's a sign above the freezer in Bosco's store that reads 'Tongues Placed on Freezer Become Property of Bosco'.
** In ''Sam and Max: The Tomb of Sammun-Mak'', the great grand-dads of Sam and Max are about to intrude on the maiden chamber of tomb guardian's daughter Nefertiti. The sign, naturally, is in hieroglyphics:
--->'''Nefertiti:''' Hold it ''right there'', Buckos! Can't you read hieroglyphics?!\\
'''Maximus:''' It's a tern, and a leaf.\\
'''Nefertiti:''' Exactly. Turn, and leave!
* In ''VideoGame/TheSims 3'', one of the towns features a river that happens to pass by the local cemetery, where there is a "No Fishing" sign posted on the river bank. If a highly skilled angler goes to that specific place between the hours of midnight and 4:00 am, s/he can, with the correct bait, catch the elusive Deathfish. Not only does the Deathfish have a high simoleon value if sold, it's one of the two ingredients used by a highly skilled chef to make Ambrosia, which makes its eater grow somewhat younger.
* In ''VideoGame/NancyDrew: Ghost Dogs of Moon Lake'', there's a post-it note that reads, "Rotten Floorboards! Watch your step" except Nancy has to step ''right on'' the rotten boards to get a clear view of the sign.
* [[http://tasvideos.org/1248M.html This Tool-Assisted Playthrough]] of ''Series/FamilyFeud'' features several such "signs" in its middle section.
* ''[[VideoGame/DisneysMagicalQuest Magical Quest Starring Mickey Mouse]]'' (along with its GBA remake, ''Magical Quest Starring Mickey and Minnie'') has a notable inversion of the trope. In the Fire level, the second level to be specific, Mickey (or Minnie, if the player decided to play as her in the GBA remake) arrives at a glass pane containing a fireman's suit that has a sign above it stating that, if there is a fire, someone has to break the glass. As if on cue with his/her entry, a block falls down and smashes the glass and has the fireman's outfit land near Mickey/Minnie, earning him/her the outfit.
* In one town in ''VideoGame/DragonQuestIX'', there is a small plot of land being used for crops, in the middle of which is a sign saying "do not step on the crops". Naturally, due to its placement and the way you read signs in ''VideoGame/DragonQuest'' games, the only way to read it is to step on the crops.
* In [[Webcomic/MegamanSpriteComic Megaman Sprite Game]], early on in the game you see a sign that warns you of the legal repercussions of stepping off the path. In order to get close enough to the sign to read it, you need to step off the path.
** Rather infamously, [[spoiler: stepping off the path at any point in the game triggers the BadEnding. See [[https://www.youtube.com/watch?v=27em0SgYYKQ here.]] ]]
* The ''Series/AreYouAfraidOfTheDark'' adventure game ''VideoGame/TheTaleOfOrpheosCurse'' has a few instances.
** There are five wardrobes in the basement.
*** Do not open until Winter (contains coats, one of which you can examine).
*** Do not open until Halloween (contains a puppet, which tries to goad you into looking in Wardrobe Five).
*** Do not open until Elevator Day (an elevator which takes you back to the wax museum).
*** Do not open until Monster Day (contains five monster masks which unlock Wardrobe Five if examined in a certain order).
*** Do not open EVER! If you try and open it, [[spoiler: you will be dragged inside by a bunch of clothes.]]
** There's also another door that says you'll be sorry if you open it. [[spoiler: You'll get caught by the Neanderthal Man if you do so.]]
* In ''VideoGame/{{Undertale}}'', the Ruins have signs warning you to stick to the path and not step on the leaves, each of which can only be read by not doing as the sign says.
* Parodied ruthlessly in ''VideoGame/TheNeverhood.'' After draining the lake in the second section of the game, it's possible to go down into the empty canyon and see the drain itself. Huge signs are placed all around it: "WARNING! DO NOT JUMP INTO THE DRAIN! YOU WILL DIE!" Klaymen can [[TooDumbToLive choose to ignore the signs and leap right in]], and sure enough...

[[folder:Visual Novels]]
* ''Franchise/AceAttorney: Justice for All'': when Phoenix and Maya investigate a really dirty and greasy cafeteria, Maya notices that apparently no-one cares about the "Keep our cafeteria clean" sign. Her suggestion is a bit more threatening:
-->'''Maya:''' Clean it or die!

[[folder:Web Animation]]
* An intro skit in ''Machinima/SanityNotIncluded'' [[ParodiedTrope parodies]] the trope.
-->'''Gray SPARTAN:''' [[http://www.youtube.com/watch?v=YvTbduIu4Pk&list=ELdSz_h4yp-8s No petting the recycling bin!]]
* Happens in ''WebAnimation/{{RWBY}}'' with the cave where the Giant Scorpion emerges from. It has old drawings of people attacking the monster with sticks and spears. This could signify that the monster had been in the cave since the original war with the Grimm and warning people to stay away. Unfortunately, since the symbols may hint that there may be ruins in the cave, it may double as SchmuckBait.

[[folder:Web Comics]]
* When the cast of ''Webcomic/{{Yosh}}'' visits Japan, the lead female is assaulted by flash perverts in a park, using a classic Japanese tag-team trick, where one sneaks up behind a woman and lifts her shirt, while the other is hidden in front with a camera. After she's "dealt" with the two, Yosh comments that there should be signs warning against such assaults. Cue a frame showing several signs hanging and standing all over the park, reading "Warning: Beware of Perverts". In Japanese.
* During the "Pirates of the Oceans Unmoving" arc of ''Webcomic/SluggyFreelance'', a flashback shows the time when Torg bought [[KillerRabbit Bun-Bun]] from TheLittleShopThatWasntThereYesterday. Finding exactly what he's looking for, for just under what he could afford to pay, he's smart enough to realize where he is, so he then asks the proprietor for a gorgeous, bikini-clad girlfriend for the single dime he had left. The proprietor then silently points to a sign that reads "Attempting to abuse Magical Shop's magicalness will incur a 10 cent penalty."
* ''Webcomic/GirlGenius'':
** If they'd looked closer, maybe that invading army would have noticed the sign on the gates to Mechanicsburg: [[http://www.girlgeniusonline.com/comic.php?date=20071116 "Trade Entrance. Invade in Front."]]
** Also, there is a chewing-gum machine in Castle Heterodyne with a sign saying "Poison -- Illiteracy Reduction"; [[DontExplainTheJoke people who can't read the sign will eat the chewing-gum and die.]]
** And aboard Castle Wulfenbach, a bubbling green [[http://www.girlgeniusonline.com/comic.php?date=20031126 laboratory pool]] labelled DO NOT DRINK. Moloch Von Zinzer evidently ignores this directive with [[ExtremeOmnivore no ill effects]].
* Actually inverted in ''Webcomic/{{Alice}}!'', in which the title character actually ''ignores'' the sign.
* One ''Webcomic/CyanideAndHappiness'' animated short features two policemen brutally enforcing a sign labeled "Do Not Read", and another nearby sign, "No babies."
* ''Webcomic/PrincessPi'' subverts this in one comic. Bottle Blonde tries to remind patrons of Burger Yellowbellied Sapsucker that they can't break any rules, because "There's a sign that says so!" She then points to a plaque reading simply, "The Sign That Says So."

[[folder:Web Original]]
* ''[[http://www.youtube.com/watch?v=YO0F6enwzEo Gun Free Zone]]'' video. Be safe -- buy yourself a sign!

[[folder:Western Animation]]
* ''WesternAnimation/{{Futurama}}'':
** In the episode "The Farnsworth Parabox", Fry and Bender need to move through the Planet Express office undetected. Bender rips the hatch off a superheated steam pipe, above which is a sign that reads, "No Crawling Around". They climb in and, well....
** In "My Three Suns", while delivering a package to the emperor of Planet Trisol, Fry drinks from a random bottle. Then it turns out that the Trisollians are a water people, and fry drank the emperor! Luckily, natives practice KlingonPromotion, which makes Fry the new emperor, and the recipient of the package. It contains a sign that says, "Do Not Drink The Emperor", which Fry hangs up next to dozens of signs surrounding the spot where the bottle was, all written in alien languages. "This got here just in time!
** In "Three Hundred Big Boys", Leela goes swimming with a whale with a swimsuit filled with rotten fish as a part of a ZanyScheme. After she dives in, a banner reading, "PLEASE DO NOT FEED THE WHALE" is seen. Leela's suit is eaten. "The suit was ugly! Whale biologist."
* ''WesternAnimation/DextersLaboratory'':
** A sign on a fence has a "stranger" drawn and a forbidden red line. A "stranger" looking exactly like it goes in, thus showing he was ''obviously'' breaking the law. Except he was actually a gardener.
** Similarly, the door to Dexter's room has several signs that say or otherwise mean "No Dee-Dees". They're only there to let the audience know she doesn't read them.
* ''WesternAnimation/KimPossible'' uses this when Ron offers Kim and Monique a pickle in the Club Banana store. Monique points out the sign "No Food, Pickled or Otherwise".
* ''WesternAnimation/TheSimpsons'' has used this gag several times:
** In "Homer the Vigilante", Herman shows Homer a "miniature version of the A-bomb" which "the government built in the fifties to drop on beatniks". Homer then goes into a day dream sequence where he [[RidingTheBomb rides the bomb]] a la ''Film/DrStrangelove'' onto a group of beatniks only for it to cut back to reality where he's actually riding the displayed bomb. Herman then points out the adjacent sign reading "DO NOT RIDE THE BOMB".
** There's also an instance early on in the episode with Homer's heart attack, when he begins a quiet prayer to God and is shushed immediately by the nurse, who points to a sign reading "NO PRAYING".
** When Homer is injured in a prison rodeo, he is treated in the prison's medical facility. When Marge remarks that he's being very stoic about the situation, he says he can't complain, then points out a sign saying "No Complaining". The doctor says that the sign's only for the prisoners, so Homer starts letting it all out: "Oh, I hurt so much! And my job is so unfulfilling...".
** Lisa is trying to ride the bus to see a museum exhibit:
--->'''Lisa:''' Excuse me, when does the bus get to the museum?\\
'''Bus Driver:''' ''[points to sign reading "Do not talk to driver"]''\\
'''Lisa:''' Sorry, it's just that this is the first time I...\\
'''Bus Driver:''' ''[taps repeatedly on the sign]''\\
'''Lisa:''' End of the line?! I thought this was Bus 22!\\
'''Bus Driver:''' Yep, Mondays and Wednesdays. On Tuesdays and Thursdays it's the 22-A.\\
'''Lisa:''' 22-A?!? But that doesn't...\\
'''Bus Driver:''' Don't make me tap the sign.
** In order to protect himself from Homer, Bart hid behind a sign reading "Report Child Abuse".
** When they made a {{Parody}} of ''Literature/TheDaVinciCode'', Lisa entered a place that had a sign forbidding it. Under it, there was another sign alternatively allowing it, stating it was a sign, not a cop.
** When Homer got lost inside a labyrinth, he tried to climb his way out but got electrocuted. He then found a sign stating it was electrified. Out of anger, he punched it and got another shock. He then found a sign reading "Signs also electrified".
** During a flashback in "Lisa's Sax", 5-year-old Bart is trying to get adjusted with his new school. On his home he was skipping on the school yard and [[ViolentGlaswegian Groundskeeper Willie]] starts yelling at him in a thick Scottish accent. Bart not understanding him continues to skip and Willie angrily asks him "Don't you understand English?" while pointing to a sign reading "ACH! KEEP OFF THE GRASS!"
** Bart is wearing a fancy Batman-style utility belt and the bullies are chasing him. He presses the belt's "Emergency" button, which gives off a siren (telling the bullies his location) and shoots off a flare which parachutes to the ground with the words "Need Help Call Police" on the 'chute. When the bullies run up to him Bart says "Can't you read? Call the police!"
* ''WesternAnimation/TheCritic'':
** In a car chase between Jay and a studio exec in LA, the freeway sign reads "High-Speed Chases use Diamond Lane".
** Jay talks to a cab driver. The driver (suitably foreign) says [[YouNoTakeCandle "Look at sign!"]]. It reads "Driver knows only three words of English."
** After Jay imagines the Statue of Liberty undressing for him, a policeman points at a sign reading "No fantasizing about statue."
* ''WesternAnimation/TimonAndPumbaa'':
** Parodied in the animated series. Timon narrowly escapes a [[PiranhaProblem piranha infested lake]] and complains that there should be a sign. Pumbaa replies "Like this one?" and points out a plain looking sign next to them saying "Beware: Piranhas". Timon tries to save face by saying the sign should be bigger and Pumbaa points out an even ''bigger'' sign with spotlights and the same word written in lights.
** And that one time when the two are in a runaway jeep headed toward a cliff (ItMakesSenseInContext). There's dozens of signs on the path leading to the cliff, and they just crash right through them. CLIFF AHEAD! *smash* STOP NOW! *smash* SERIOUSLY! *smash* THESE SIGNS *smash* ARE EXPENSIVE! *smash*
* The ''[[WesternAnimation/LooneyTunes Merrie Melodies]]'' cartoon ''A Day at the Zoo'' had an old lady at a zoo trying to sneak some peanuts to a monkey. He throws them back at her and shouts "Hey, sister! Can't you read?!", holding up the "do not feed the animals" sign for emphasis.
** In "Cat Tails for Two", after George falls into the water by accident, Benny points to a "No swimming" sign and scolds him with "George, what's the matter with you? Can't you read? It says 'no fishing'!"
* Hilariously done in the ''WesternAnimation/LooneyTunes'' short "Cat-Tails for Two". When the cat George is knocked overboard after being fooled by WesternAnimation/SpeedyGonzales, his friend Benny scolds him by pointing to the sign, saying, "George, can't you read? It says No Fishing!" (It actually says "No Swimming"; Benny clearly can't read.)
* The ''WesternAnimation/EdEddNEddy'' episode "Stop, Look, and Ed" used these as part of the plot. Eddy doesn't want to follow the rules and convinces the other kids to ignore signs as well. Also, Ed goes [[LoopholeAbuse under some grass instead of on it]] due to a "Keep off the Grass" sign, and Edd is forced to concede "Well, I suppose technically that's not ''on'' the grass...".
* In the Creator/TexAvery cartoon ''WesternAnimation/WhoKilledWho'', a detective ignores the "Do Not Open Till X-Mas" sign on a door and tries to force it open. SantaClaus himself shows up to admonish him: "Can't you read?"
* In an episode of ''WesternAnimation/SpongeBobSquarePants'', Squidward is closing up shop at the Krusty Krab and puts up the CLOSED sign just as a customer walks up. He asks if they're open, to which Squidward replies, "Read the sign." The customer then immediately makes an order.
* In the ''ComicStrip/{{Peanuts}}'' special ''WesternAnimation/SnoopyComeHome'', Snoopy is continually frustrated by signs that prevent him from going where he wants and doing what he wants, either in general or because he is a dog. Snoopy is actually happy with the last one he sees because it is at the building his previous owner lived and he can use it as an excuse (to break it to her gently) why he cannot to return to her. Snoopy loves both his previous owner and Charlie Brown, but he just isn't particularly thrilled at the thought of living with her other pet, '''a cat'''.
* In ''WesternAnimation/FamilyGuy'', when Peter and Lois are buying fake documents at a supermarket in Cuba, they realize they have no money and ask the cashier if they will accept [[InsaneTrollLogic bits of string]] instead. The cashier replies, "Sorry, store policy" and points to a sign noting... that they don't accept bits of string.
* WesternAnimation/{{Chowder}} and Mung once hid behind a sign that forbade hiding behind it. Not that the sign would be a good hiding spot regardless of what it read.
* The "Do not throw pineapples in the lava" signs in the ''WesternAnimation/TotalDrama World Tour'' finale.
* ''WesternAnimation/RockosModernLife'': Rocko, looking for a parking space, finds an open one with a "Don't even THINK about parking here" sign next to it. He contemplates for a moment, and a nearby traffic cop immediately issues him a citation.
* In one episode of ''WesternAnimation/XMenEvolution'', Rogue gets angry with Kitty for phasing through the bathroom door while she's in it, ignoring the sign.
-->'''Rogue:''' ''[kicking Kitty out]'' The sign says "Occupied"!\\
'''Kitty:''' Sorry! Hey, who can read this early in the morning?
* ''WesternAnimation/TheHairBearBunch'': In "Raffle Ruckus", Hair Bear, having won the zoo in a raffle and now taking on a zookeeper's responsibilities, admonishes some visitors about not reading a "Do Not Feed The Animals" sign after Fumbo the elephant gets his trunk tied up in a fence post reaching for a visitor's peanut.
* In the MGM ''Captain and the Kids'' cartoon "Petunia Natural Park", the Captain contemplates on feeding a sad-looking bear despite a "Don't Feed the Animals Sign". He decides to give him a sandwich, only for bear to turn out to be a cop in disguise who proceeds to beat the Captain with his billy club.
* ''WesternAnimation/{{Fillmore}}'': In "A Forgotten Yesterday", Fillmore is on a jetski in X's lake, and almost crashes into a buoy mounted with a sign that reads "Watch Out For Floating Signs"
* ''WesternAnimation/{{Mixels}}'': In "Every Knight Has Its Day", there are two signs for this purpose: "Gassy Mud For Mixamals Only" (Found right after Mixadel is thrown into the mud pit by angered Mixamals) and "You Can't Come In Here", when Paladum is not allowed in the zoo by the gatekeeper.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': In "[[Recap/MyLittlePonyFriendshipIsMagicS5E8TheLostTreasureOfGriffonstone The Lost Treasure of Griffonstone]]", when Pinkie Pie is about to burst into song, Gilda shows her there is an actual "no singing" sign in Griffonstone (a barred picture of a singing griffon). This puzzles Pinkie to no end, as ponies in Equestria are free to start singing at the drop of a hat wherever they go, and often do so.
* ''WesternAnimation/JusticeLeague'': In "A Better World", Flash ignores a "Please Don't Pick The Flowers" sign and picks one. Poison Ivy calls him out on it.

[[folder:Real Life]]
* Some shops also have a similar sign than the one in ''Wayne's World'', reading "Customers playing 'Smoke on the Water' may seriously wish to reconsider their motives in buying musical instruments." "Sweet Child of Mine," "Freebird," and "Stairway to Heaven" have also been given this treatment. Working in a music shop must be hell.
* Sign sometimes seen in science labs: "Caution: Do Not Look into Laser with Remaining Eye".
* Another favourite "Caution: Only bring cheap watches/credit cards you weren't planning on using anymore near magnet."
* At least one lab has a sign in the hallway reading: "CAUTION: Active Robot." Do not stand in its way, or else.
* [[http://www.telegraph.co.uk/travel/picturegalleries/signlanguage/ A collection of bizarre signs]], some of which fit the trope, including [[http://www.telegraph.co.uk/travel/travelnews/4678744/Kissing-banned-at-Warrington-railway-station.html this "no kissing" sign]].
* Back in the day in St. Louis, there was a wonderful greasy spoon that looked like it was a Hollywood set dresser's idea of a Midwestern diner. It was called "Irv's Home Cooking." When (inevitably) a drunk college kid would ask "Where's Irv?", the [[ServiceSectorStereotypes stock character waitress]] would snap her gum, point at the sign out front and say, "Cantcha read the sign? He's home cooking."
* And finally, who HASN'T seen a "no standing" sign, only to stand next to it? ("Standing", in the first case, meaning the act of leaving your car running in the parking space). Or, for that matter, a "No Loitering" sign.
* 4 words: "Slow Children at Play". AmbiguousSyntax results because of the lack of a comma between "Slow" and "Children".
* Thanks to ValuesDissonance, [[http://globalconquest.ca/archives/no_durians.jpg this "No Durians"]] sign falls under this trope just because people might see it and want to try it out to see what's so bad. The main reason behind these signs are that Durians [[ForeignQueasine smell like crap]]. However; you're very unlikely to find the fruit itself outside of South-eastern Asia.
* Related, but with a different intent are signs that read "No Peanuts" or "No Raw Onions". Given how sensitive Peanut Allergies can be... not really a laughing matter. The "Raw Onions" case is incredibly specific, too -- it's actually on a building at Colorado State University because a professor has a ''severe'' Onion allergy, just as bad as peanut allergies.
* "No Turn On Red." The freedom to make a right turn on a red light was introduced in most of the US and Canada as a response to the gas crisis -- the idea being that if it's safe to turn, you might as well do it rather than waste gas idling at the light -- and it's now a standard part of drivers' education. These signs appear at busy or obstructed intersections and are among the easiest to miss because they tend to be small black-and-white signs. (Plus, shrubberies can block signs off.) It's a fair bet that if you've driven a car in a medium- or large-sized city in North America, you've blown one of these signs without noticing it.
* An anecdote about the Civil War Battle of Gettysburg: On the first day of the battle, part of the Union army's XI corps had taken up a position in the town's cemetery as a reserve position. During the events of the first day's battle, the rest of the Union troops were driven back into the cemetery by the Confederates. On the second day of the battle, a junior officer to Gen. O.O. Howard (the XI corps commander) jokingly pointed out a sign in the cemetery saying "Shooting and Use of Firearms is Prohibited". The officer asked if they would get in trouble for violating the sign. Shortly after, a cannonball struck the sign and destroyed it. Gen. Howard reportedly quipped "It appears the ordinance has been rescinded, and the shooting may go on."
* There was a sign in a mall escalator in the Philippines warning about hitting a sign on the way up the escalator. In other words, it's a sign warning people about hitting their head on it. The real reason it was put up was to get people who aren't paying attention to hit their head on it and duck than to accidentally get them stuck in the wedge where the two escalators meet.
* One of the last photo sessions Music/TheBeatles had was that of the group reclining on a lawn with a "Keep Off the Grass" sign clearly in view.
* In the early 1980s, a 12-year-old boy visiting Ride/SixFlags Over Georgia boarded a car on the roller coaster ''The Great American Scream Machine'' and flagrantly disobeyed a sign and verbal instructions telling riders to keep their arms in the car, holding the bar in front. As a result, the boy's arms were mangled. The boy's parents attempted to sue the park for his medical bills, claiming extra effort should have been used to enforce the rule.
* One man used a sign that accidentally said something wrong to wriggle out of a parking violation. Specifically, he argued that because the sign actually read "No ''Stoping''" instead of "No ''Stopping''", he was allowed to stop there as he hadn't engaged in any "stoping," that is, mining ore from underground, in the area.
* Anyone who has ever worked in a customer service job can probably tell you that you could have a huge sign on the front door that says "Closed" with the hours of operation listed below, and someone will still try to pull the door open and bang on it furiously wondering why nobody is letting them in.
* Creator/GaryOldman recalled during filming of ''Film/AirForceOne'', the sound stage had a large sign that said "NO DRINKING, NO SMOKING AND NO EATING ON SET". One day, he saw Creator/HarrisonFord standing beneath the sign with a burrito, a cigar and a cup of coffee.