* In ''Theatre/GlengarryGlenRoss'', Williamson suddenly realizes, thanks to a very long TheReasonYouSuckSpeech by Levene, who robbed the office: [[spoiler:none other than Levene himself. Levene called Williamson out on a lie about cashing Lingk's check, which Levene only could have known if he'd robbed the office, since it was the one time in Williamson's career that he didn't take the checks down to the bank]]. Williamson later confronts the thief, and asks him a very simple question: "How did you know I made it all up?"
* In Creator/AynRand's play ''Night of January 16th'', Karen Andre, accused of murdering Bjorn Faulkner, is nearing the end of her testimony, when the SurpriseWitness barges into the courtroom. Karen frantically tries to prevent him from saying anything, but he tells her, "Your sacrifice is useless: Bjorn Faulkner is dead." Karen faints from this revelation, and the curtain falls on the second act.
* From ''Theatre/{{Wicked}}'': 'You have no real power,' as well as a WHAM moment when Glinda shows the Wizard Elphaba's keepsake, [[spoiler: identifying him as her father, moments after having had her murdered.]]
** Another one takes place at the end, at the site where Elphaba made her last stand. [[spoiler: The Scarecrow comes on stage, knocks on the floor]], and says two words: [[spoiler:"It worked!" Elphaba, alive and well, comes up through a trap door and reunites with her beloved Fiyero before they make plans to flee to Earth.]]
* In ''Theatre/{{Urinetown}}'', [[AllKnowingSingingNarrator Little Sally asks Officer Lockstock]] what Urinetown is like. In the interest of [[MediumAwareness maintaining dramatic tension]], Lockstock ''tries'' to avoid answering the question, telling her "Look, its power depends on mystery. I can't just blurt it out, like '[[spoiler:There is no Urinetown! We just kill people!]]'"
* ''Theatre/CharlieAndTheChocolateFactory'' ends with a Wham Song, the TriumphantReprise of "It Must Be Believed to Be Seen". The reprise reveals first that [[spoiler: the tramp at the dump whom Charlie befriended was Willy Wonka in disguise -- same actor and all -- which means he rigged his own Golden Ticket contest and was secretly on the boy's side all along]], and second that [[spoiler: Mr. Wonka's retiring from running the factory so he can pursue new dreams...''in the audience's world''...which he can travel to -- and does -- simply by way of an ImaginationBasedSuperpower]]. While a few hints to the first revelation are there for sharp/GenreSavvy viewers (they at least make for some RewatchBonus), the second revelation is a definite surprise. (It helps that none of this is in the novel or either film adaptation of same.)
* ''Theatre/SpringAwakening'': Frau Bergman speaking to Wendla after taking her to the doctor, [[spoiler: "You're going to have a child.]]" Another example is when Melchior is waiting for Wendla in the church graveyard, [[spoiler: "My God, all these little tombs... And here, a fresh one... Here Rests in God, Wendla Berg- No?! Born the.. Died- ?! Of anemia??]]"
* ''{{Theatre/Hamilton}}'' is practically a Wham ''Show'', but a notable line is in "The World Was Wide Enough," said by Burr pre-duel:
-->[[spoiler: "I had only one thought before the slaughter: ''this man will not make an orphan of my daughter.'']]
** "Jefferson has my vote!" in "The Election of 1800," spoken by Jefferson's long-time enemy, UsefulNotes/AlexanderHamilton, over his friend UsefulNotes/AaronBurr. This sets off the chain of letters to their DuelToTheDeath.[[note]]In RealLife it took a ''second'' race where Hamilton scorched Burr (this time for governor of New York) to push Burr over the edge, but 1800 certainly contributed to it.[[/note]]
** If you don't know the show going in, then Burr's line "And me? I'm the damn fool who shot him" at the end of the opening song certainly qualifies (the fact that the narrator is Aaron Burr isn't revealed until this point -- it's something of a [[FirstEpisodeSpoiler First Song Spoiler]]).
** In "Tomorrow There'll Be More Of Us":
--->'''Alexander''': "It's [a letter] from John Laurens. I'll read it later."
--->'''Eliza''': "No. [[spoiler:It's from his father.]]
--->'''Alexander''': "[[spoiler:His father?]]"
** "I'm stepping down; I'm not running for President" from Washington. A ForegoneConclusion to the audience, but a major in-universe wham and the point where [[CerebusSyndrome everything starts going wrong for Hamilton]]. It also counts as a wham for real-life politics; as King George points out in his next song, the idea of a leader ''voluntarily'' relinquishing power was unheard of in those days, especially when one knows that Washington was so popular at the time that he could've declared himself PresidentForLife and almost nobody would've opposed him. There's a reason historians commonly rank this as among the most important political decisions ''ever made''.
* ''Theatre/{{Ragtime}}'': The end of the song "He Wanted To Say." Mother's Younger Brother wants to join with a [[FaceHeelTurn Face-Heel Turned]] Coalhouse, and most of the song is the things the men want to say to each other (Mother's Younger Brother wants to fight for the same reasons Coalhouse does, Coalhouse knows Mother's Younger Brother has no idea of the animosity he has experienced because of his race). However:
-->'''Emma Goldman:''' But all he said was...
-->'''Mother's Younger Brother:''' [[spoiler:[[FaceHeelTurn I know how to blow things up!]]]]
* ''Theatre/NatashaPierreAndTheGreatCometOf1812'': At the end of Act 1, the moment when Natasha finally decides between her betrothed and the man she is having an affair with.
-->'''Natasha:''' [[LoveConfession I will love you,]] [[spoiler:[[YourCheatingHeart Anatole.]]]]
** To a lesser extent, one of Dolokov's lines about Anatole right before [[DuelsDecideEverything the duel.]]
* In ''Theatre/LesMiserables'':
** "You maintain he made a present of this silver-" "That is right."
** In-universe, it's ''quite'' a shock to all present (especially Javert) when Monsieur le Mayor reveals himself to be Jean Valjean (although for the audience, we've already had an entire song where he confesses as much, just in case you couldn't figure it out from them being the same actor).
** The moment in "Drink With Me" when the audience (and the students) realizes exactly what is going to happen to this revolution:
--->'''Grantaire''': "Drink with me to days gone by/Can it be you fear to die?/Will the world remember you when you fall/Can it be your life means nothing at all?"
* ''Theatre/InTheHeights'': "Let everybody know: [[spoiler:Abuela Claudia]] passed away at noon today." It's ''quite'' the Mood Whiplash.
** A more minor example: after "96,000" explored what each of the characters would do with the winning lottery ticket, "Pacencia and Fe" revealed who won ([[spoiler:Abuela Claudia]]) with a single line: "What shall I do with this winning ticket?"