Homer: All right, Marge, I'll tell you, but first you have to promise you will not get mad.
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:
—The Simpsons, "Lisa The Greek"
- 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.
- 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 Unstoppable Rage.
- 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...Ahchoo: Chilled.
- 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.
- 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.GRAMS: Explosion.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."
- 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 Tracy Ullman 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!
- In 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: "Not gonna laugh?" Well, that's just what you say. And then what happens once I tell you? You laugh.
- Lenny even lampshaded the trope before he told Oscar his secret:
- The Adventures of Dr. McNinja combines it with Implausible Deniability .
Dr. McNinja: You can talk?Motorcycle: Promise you won't be upset?Dr. McNinja: Yes.Motorcycle: Yes.