Marge: I promise I will get mad, because I always do when you make me promise I won't.
Two characters have a conversation like this:
- Character A: I need some advice from you.
Character B: Shoot.
Character A: Promise me you won't laugh, okay?
Character B: Okay then.
Character A: How do I get rid of this rash in the shape of lovehearts on my left buttock?
Character B: Bwahahahaaha!
Character A: You promised you wouldn't laugh!
Character B: Sorry dude, I didn't mean to.
Sometimes Character B is Character A's friend; they may try to unsuccessfully stifle the laugh. If they're The Rival (or The Jerkass) then they'll probably just be in peals of laughter. "Promise me you won't laugh" isn't the only scenario, though; sometimes it's substituted with "you won't scream", "you won't panic", "you won't get mad" or something similar. Almost every time the person goes back on the promise. Beginning to be subverted more and more often in the style of The Simpsons quote at the top of the page, or by someone saying "I'm not promising anything till I hear what you say."
Another variation on the trope is a conversation that goes something like this:
- Character A: What happened?
Character B: Trust me, you don't want to know.
Character A: No really, tell me.
Character B: *insert gross/inappropriate/silly/ridiculous story here*
Character A: ... you were right. I didn't want to know.
- Kanon: That's one way to reunite with your Not Quite Dead girlfriend...
- Full Metal Panic!, Sousuke forgot to bring Chidori's notebook, and he promised her that she must not panic no matter how bad the situation is. Instead, she went into an Unstoppable Rage.
- In Boarding School Juliet, Persia asks Inuzuka to close his eyes while, unbeknownst to him, she gives him her necklace. He breaks this promise the instant he feels her getting close to him (to be fair, he is a teenager).
- Jaune Arc, Lord of Hunger: In "Control", Jaune asks Pyrrha to promise that she won't think he's crazy before confiding to her about the strange dreams he's recently been having.
Jaune: Before I explain, I want you to promise me something Pyr. Promise that you won't think I'm crazy.
Pyrrha: Jaune, what are you talking about? What's going on?
Jaune: Please Pyr! I need to hear you say it!
Pyrrha: Jaune, I promise on my name that I will not think you are crazy.
Film - Animated
- Shark Tale: Lenny makes Oscar promise not to laugh before telling him how he's different from other sharks. He's a vegetarian. While Oscar does snort for a split second, he takes a deep breath and more or less manages to keep his promise. Lenny even lampshaded the trope before he told Oscar his secret:
Lenny: "Not gonna laugh?" Well, that's just what you say. And then what happens once I tell you? You laugh.
Film - Live-Action
- Casper (1995 movie) has Casper muffle Kat and explain his position as a friendly ghost, and offer to un-muffle her if she promised not to scream. Of course, as soon as she could speak again, she screams.
- Averted the second time he does it.
- The Sixth Sense: Cole and his mother are having a conversation about a pendant of her mother's. Cole's mother is sure Cole's taking the pendant. She tells him, "I promise I won't get mad," and she asks him if he took the pendant. He tells her no — as he tells her every time. And naturally, she gets angry with him.
- Subverted in Waking Ned Devine: Finn asks Maggie to read some of her poetry (actually, greeting card texts) to him. She makes him promise not to laugh... and then breaks into laughter after her own first word.
- Robin Hood: Men in Tights: Maid Marian pleads with Robin not to enter the archery contest that she knows is a trap. Of course, the promise of facing an undefeated archer is too tempting for Robin Hood.
Maid Marian: Robin, promise you won't go.
Robin Hood: All right, I promise you won't go.
Maid Marian: Thank you.
Ahchoo: But wait a minute, Robin, didn't you just...
Robin Hood: Cool it...
- Near the climax of M. Night Shyamalan's The Village, right before Edward Walker shows his daughter Ivy the monster costumes they keep in the shed: "Do your very best not to scream."
- In Pulp Fiction, Mia Wallace calls Vincent out on asking her not to be offended by a question, saying that if she promises not to be offended and then is offended, he'll have forced her to break a promise.
- In Young Frankenstein, the doctor asks his assistant Igor (pronounced eye-gor) to tell him whose brain they put in the monster. After the doctor promises not to get angry (even emphasizing the "not") Igor tells him it was "Abby somebody. Abby Normal I think". The doctor then attempts to strangle him.
- In the Discworld book Going Postal, Moist von Lipwig reveals his Boxed Crook backstory to Adora Belle Dearheart, including the fact that he was the crook whose forgeries got her fired from her previous job at a bank. He first makes Adora promise not to make any sudden movements, because "I think that in a few seconds you'll try to kill me." Played with in that Adora does hold to this promise, with some reluctance.
- Subverted in The IT Crowd. After a masseur kissed Roy on the arse, he was about to tell Moss but first made him promise not to laugh. Afterwards, Moss is disgusted that Roy would think he'd find it funny.
- Angel played this trope adorably in "Waiting in the Wings". A self-conscious Gunn makes Fred promise not to laugh at him in his tux. She promises, then immediately bursts out laughing because he's "just so pretty." This foreshadows their hook up later in the episode.
- Castle: Beckett uses this to pull a Bait-and-Switch on Castle, after agreeing to a private showing of her Nebula 9 cosplay costume. Castle agrees not to laugh, lusting instead as Beckett shows him some leg from behind the door. Then she leaps out wearing a hideous alien mask, so the laugh is on Castle.
- Lucifer: In the first season's final episode, Lucifer promises Chloe he will let her go alone to save Trixie. Being the devil he is, "his word is his bond". Though, he still goes to help her, since he didn't say anything about following.
- The Goon Show: In the episode "Shangri-La Again", Major Bloodnok is supposed to have obtained an aeroplane to fly the Embassy staff to safety:
Bloodnok: The plane...the plane. Ooo! Ooo heavens!
Seagoon: What's up?
Bloodnok: Look - if I tell, promise you won't blow up?
Seagoon: I promise.
Bloodnok: I forgot to order it.
Bloodnok: You promised!
- Big The Musical has an extended sequence in the song "This Isn't Me" where Josh, suddenly an adult, asks his mom not to turn around yet, and not to scream when she does. She instead asks why she would scream, and of course does just that when she sees him.
- Fire Emblem Elibe has a support conversation between Eliwood and Hector, where Hector's thinking of a dream he had and Eliwood asks him to share it. His response before doing so: "Laugh and I'll kill you."
- In one of the after-stories in the If My Heart Had Wings FLIGHT DIARY expansion, Genius Ditz Amane has been giving dating advice to her best friend, Isuka, claiming to have a year of experience while actually only having about a month's worth instead. Isuka catches the discrepancy and asks for more details. Amane makes her promise to not laugh and comes clean in admitting she thought she was dating the hero for a year before they actually got together. Isuka, of course, loses it.
- * She-Ra and the Princesses of Power: During the end stages of saving Catra Entrapta says this to save everyone.
Bow: [Surrounded by Horde clones ready to capture them] What do we do?
Entrapta: I've got an idea, but you have to promise that you won't be mad that I maybe, possibly, *100 percent disregarded all those times you told me not to tinker with the ship.*
Bow: Entrapta, if you get us out of here, you can tinker with the ship as much as you want!
Entrapta: [Screech of triumph]Great! Hey, Darla!
- Braceface, "Leap of Faith" (last episode), "promise me you won't panic" (or "freak out", or something similar) when Alden tells Brock he's fallen back in love with Sharon.
- The Simpsons, "Lisa The Greek", subverted (see quote).
- In one of the original The Tracey Ullman Show shorts, Bart gets all of his hair cut off at the barbers. He comes home wearing a bag on his head, and makes the family promise not to laugh when he takes it off. Natually, they guffaw hysterically when he does.
- Transformers: Animated, Return of the Headmaster:
Sentinel: I need you to come to my position. And promise me one thing - that you won't laugh!
Optimus: [sees Sentinel - as a head, victim of the Headmaster, and burst into hysterical laughter]
Sentinel: You promised you wouldn't laugh!
- The Adventures of Dr. McNinja combines this trope with Implausible Deniability.
Dr. McNinja: You can talk?
Motorcycle: Promise you won't be upset?
Dr. McNinja: Yes.
- Scary Go Round: When last seen in the year 2032, Future-Scout Jones had just extracted a promise from her stepmother and defense lawyer, Shelley Winters, not to get mad at what Scout was about to say. We dont know what followed, but as Scout was, or should have been, about to confess to illegally travelling through time in order to attempt repeatedly to prevent Shelley from marrying Scouts father, mostly by trying to murder Shelley, even the good-hearted and weirdness-hardened Shelley may have had a little difficulty keeping to the letter of that promise.