* 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 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 hints to the first revelation are there for viewers, the second revelation is a definite surprise.
* ''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/DearEvanHansen'': Directly after Good For You, Evan has a "confrontation" with [[spoiler:"Connor" (really just a manifestation of himself)]] in which [[spoiler: Evan wants to tell the truth about what he's done, and "Connor" talks him out of it. This results in an altercation in which "Connor" repeatedly asks Evan how he broke his arm, culminating in this:]]
-->'''Connor:''' [[spoiler:How’d you break your arm? How’d you break your arm, Evan]]?\\
'''Evan:''' [[spoiler:I fell]].\\
'''Connor:''' [[spoiler:Really? Is that what happened]]?\\
'''Evan:''' [[spoiler:[[SuddenlyShouting YES!]] I was- I lost my grip and then I just- I fell, so]]]...\\
'''Connor:''' [[spoiler:Did you fall? [[BungledSuicide Or did you let go]]]]?
* ''{{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?]]"
* ''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'':
** When the priest is super supportive of Valjean
--->'''Police''': You maintain he made a present of this silver--\\
'''Priest''': That is right.
** 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 death 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?"
* In ''Theatre/TheRiseAndFallOfTheCityOfMahagonny'', Trinity Moses's spoken line demanding that Jimmy pay for his drinks is not only a turning point in its immediate context, rudely interrupting Jimmy's drunken fantasy of sailing to Alaska, but, since it turns out Jimmy doesn't have the money, it also leads directly to his arrest, show trial and execution.
* ''Theatre/BostonMarriage'' by Creator/DavidMamet: The play begins with Anna and Claire, best friends, exchanging news. Anna has become the mistress of a wealthy man who showers her with money and gifts, including an emerald necklace that has been in his family for generations; Claire has fallen in love with a young lady who will be calling shortly for an assignation. At the end of the first act, the young lady arrives, is greeted by both women, and goes off with Claire -- only for Claire to return almost immediately to announce an unforeseen complication with drastic consequences for both of them:
-->'''Claire:''' [[spoiler:She asks why you are wearing her mother's necklace.]]
* From ''Theatre/SweeneyToddTheDemonBarberOfFleetStreet'': "...you knew she lived. From the moment I first entered your shop, YOU KNEW MY LUCY LIVED!"
** Immediately afterward, there's Mrs. Lovett's desperate attempt to invoke ExactWords to spare herself, proving just how deeply self-serving she really is: "No, no, not lied at all! No, I never lied! Said she took the poison--she did--never said that she died!"
* In ''Theatre/{{Assassins}}'', [[VillainSong "The Ballad of Booth"]] frames John Wilkes Booth as [[VillainHasAPoint having a legitimate grievance]] against Abraham Lincoln. Then, as the song dips more into MotiveRant territory, it all changes with a single word that shows why Booth is really angry at the President: "How the Union can never recover from that vulgar, high and mighty, NIGGER-LOVER!"
* The majority of ''Theatre/{{Ebenezer}}'' is built up as a story Dickens tells Scrooge to get him to realize the truth about his past. [[spoiler:Then it's revealed Scrooge knew it from the start.]]
-->'''Scrooge:''' You must think me a simpleton, sir. [[spoiler:Don't you think I've known about everything from the start? Don't you think I've known about Marley's motives all along?]]