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* On the ''Series/{{Angel}}'' end is Gunn's epic version of this after his part in [[spoiler: Fred's death]].'
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* On the ''Series/{{Angel}}'' end is Gunn's epic version of this after his part in [[spoiler: Fred's death]].'death. He wanted to keep his super smarts and signed a paper saying that a delivery could be made to Wolfram and Hart. What he didn't know? The delivery was the tomb of Illyria, which was sent to infect Fred and brutally kill her so that her body could be used to host Illyria]].
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** Angel after the gypsy curse personifies this trope. He now believes he has to atone for what he has done.
** Buffy has this twice, once in Season 6, when she learns that she ''didn't'' come back wrong and has been doing all sorts of horrible stuff of her own free will, and again in Season 8 when Giles is killed, magic is destroyed, and the Slayer line is ended, as a result of her space frak with Angel.
** Angel, after he turned good again from being evil having [[spoiler: tried to kill Buffy multiple times, murdered Giles' girlfriend, and ALMOST banished the entire population of Earth to hell]] he was so wracked with guilt that it eventually caused the decision to leave Sunnydale forever, which in turn began his own spin-off series.
** Buffy has this twice, once in Season 6, when she learns that she ''didn't'' come back wrong and has been doing all sorts of horrible stuff of her own free will, and again in Season 8 when Giles is killed, magic is destroyed, and the Slayer line is ended, as a result of her space frak with Angel.
** Angel, after he turned good again from being evil having [[spoiler: tried to kill Buffy multiple times, murdered Giles' girlfriend, and ALMOST banished the entire population of Earth to hell]] he was so wracked with guilt that it eventually caused the decision to leave Sunnydale forever, which in turn began his own spin-off series.
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** Angel after the gypsy curse personifies this trope. He now believes he has [[TheAtoner to atone atone]] for what he has done.
** Buffy has this twice, once in Season 6, when she learns that she ''didn't'' come back wrong and has been doing all sorts of horrible stuff of her own free will, and again in Season 8 when [[spoiler: Giles is killed, magic is destroyed, and the Slayer line is ended, as a result of her space frak withAngel.
Angel.]]
** Angel, afterhe turned good again from being evil his soul was restored. His [[JekyllAndHyde soulless, sadistic alter ego]] having [[spoiler: tried to kill Buffy multiple times, murdered Giles' girlfriend, brutally tortured Giles, feeding off of and killing numerous people off screen, and ALMOST banished the entire population of Earth to hell]] hell]], he was so wracked with guilt that it eventually caused the decision to leave Sunnydale forever, which in turn began his own spin-off series.
** Buffy has this twice, once in Season 6, when she learns that she ''didn't'' come back wrong and has been doing all sorts of horrible stuff of her own free will, and again in Season 8 when [[spoiler: Giles is killed, magic is destroyed, and the Slayer line is ended, as a result of her space frak with
** Angel, after
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* ''Series/NightAndDay'''s Alex Wells during the final episodes, on discovering that he slept with his own daughter.
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* ''Series/PersonOfInterest'': In "Karma," Finch's reaction when he realizes that the woman he's [[OOCIsSeriousBusiness about to murder]] had nothing to do with [[RoaringRampageOfRevenge what he's seeking revenge for]].
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* ''Series/PersonOfInterest'': In "Karma," Finch's reaction when he realizes that the woman he's [[OOCIsSeriousBusiness about to murder]] had nothing to do with [[RoaringRampageOfRevenge what he's seeking revenge for]].''Series/PersonOfInterest'':
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--->'''Root:''' And the punchline, is that your Machine keeps telling me to save Cyrus. How badly did you have to break [[ItIsDehumanizing it to make it]] care about people so much?
** In "Karma," Finch's reaction when he realizes that the woman he's [[OOCIsSeriousBusiness about to murder]] had nothing to do with [[RoaringRampageOfRevenge what he's seeking revenge for]].
** In "Karma," Finch's reaction when he realizes that the woman he's [[OOCIsSeriousBusiness about to murder]] had nothing to do with [[RoaringRampageOfRevenge what he's seeking revenge for]].
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* And it's played for laughs in Series/FullHouse during the episode "Three Men and Another Baby", when Stephanie reluctantly gives Mr. Bear to Michelle, she philosophically claims it was worth it to make the latter happy, but no sooner does she say that does she leave the room and exclaim, "What have I done?!"
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* ''Series/PersonOfInterest'': In "Karma," Finch's reaction when he realizes that the woman he's [[OOCIsSeriousBusiness about to murder]] had nothing to do with [[RoaringRampageOfRevenge what he's seeking revenge for]].
** Root has this reaction in "/" when she realizes that the man she's been tasked with protecting is only in the position he's in after his life was ruined by the deaths of his best friends... deaths that were actually [[ProfessionalKiller murders committed by Root]].
** Root has this reaction in "/" when she realizes that the man she's been tasked with protecting is only in the position he's in after his life was ruined by the deaths of his best friends... deaths that were actually [[ProfessionalKiller murders committed by Root]].
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** More seriously in ''Identity'', [[spoiler:Chloe Sullivan]]'s horrified expression after [[spoiler:under the influence of {{Brainiac}}, she]] renders the bad guy of the week catatonic by overloading his brain with information to protect Clark.
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** More seriously in ''Identity'', [[spoiler:Chloe Sullivan]]'s horrified expression after [[spoiler:under the influence of {{Brainiac}}, ComicBook/{{Brainiac}}, she]] renders the bad guy of the week catatonic by overloading his brain with information to protect Clark.
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* This is pretty much Uncle Phil's reaction at the end of ''Series/TheFreshPrinceOfBelAir'' episode, "Just Say Yo...", after a tearful and utterly remorseful Will admits to the family that the drugs that nearly killed Carlton was his, but that he had been given them by someone else due to the stresses he had with his job, school and sports wiping him out and just put them in his locker. Phil's reaction was this because he realized Will was right mere moments before when he admitted he had the drugs, but never took him and he just embarrassed himself in front of the family for no real reason.
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* This is pretty much Uncle Phil's Will's reaction at from the middle to the end of ''Series/TheFreshPrinceOfBelAir'' episode, "Just Say Yo...", especially after a tearful and utterly remorseful Will admits to the family that the drugs that nearly killed Carlton was his, but that he had been given them by someone else due to the stresses he had with his job, school and sports wiping him out and just put them in his locker. Phil's reaction was this because he realized Will was right mere moments before when he admitted he had the drugs, but never took him and he just embarrassed himself in front of the family for no real reason.locker.
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* ''Series/HouseOfAnubis'': Fabian has a moment of this, repeating "What have I done...what have I done?", when accidentally checkmating Nina during the Senet game, and getting her sent down into, at the time, nobody knew where. Throughout the next episode, he got increasingly desperate and panicked over her disappearance that he eventually had an actual breakdown, one of the bigger TearJerker moments of the second season.
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* ''Series/HouseOfAnubis'': Fabian has a moment of this, repeating "What have I done...what have I done?", when accidentally checkmating Nina during the Senet game, and getting her sent down into, at the time, nobody knew where. Throughout the next episode, he got increasingly desperate and panicked over her disappearance that until he eventually had an actual breakdown, one of the bigger TearJerker moments of the second season.
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* ''Series/HouseOfAnubis'': Fabian has a moment of this, repeating "What have I done...what have I done?", when accidentally checkmating Nina during the Senet game, and getting her sent down into, at the time, nobody knew where. Throughout the next episode, he got increasingly desperate and panicked over her disappearance that he eventually had an actual breakdown, one of the bigger TearJerker moments of the second season.
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* Curtis from sci-fi drama ''{{Misfits}}'' can sporadically turn back time and re-play certain events from his past whenever he has one of these moments. Of course, it [[ButterflyOfDoom doesn't always work out for the best]].
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* Curtis from sci-fi drama ''{{Misfits}}'' ''Series/{{Misfits}}'' can sporadically turn back time and re-play certain events from his past whenever he has one of these moments. Of course, it [[ButterflyOfDoom doesn't always work out for the best]].
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* In ''Series/{{Battlestar Galactica|Reimagined}}'', Gaeta, during the [[spoiler: mutiny on Galactica in season 4. After Gaeta helps Zarek take over Galactica, Gaeta insists on giving Admiral Adama a court-martial for conspiring with the Rebel Cylons. But when Zarek has the [[MoralEventHorizon Quorum of Twelve gunned down]] for refusing to recognize him as President over Laura Roslin, Gaeta has a bit of a [[VillainousBSOD revelation]] while looking over their dead bodies.]]
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* In ''Series/{{Battlestar Galactica|Reimagined}}'', Galactica|2003}}'', Gaeta, during the [[spoiler: mutiny on Galactica in season 4. After Gaeta helps Zarek take over Galactica, Gaeta insists on giving Admiral Adama a court-martial for conspiring with the Rebel Cylons. But when Zarek has the [[MoralEventHorizon Quorum of Twelve gunned down]] for refusing to recognize him as President over Laura Roslin, Gaeta has a bit of a [[VillainousBSOD revelation]] while looking over their dead bodies.]]
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* ''Series/BattlestarGalacticaClassic'' in its premiere episode has President Adar moaning at how his gullible stupidity falling for Baltar's manipulations has led to the destruction of Humanity, even as the Cylons are wiping out the fleet.
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* ''Series/BattlestarGalacticaClassic'' ''Series/BattlestarGalactica1978'' in its premiere episode has President Adar moaning at how his gullible stupidity falling for Baltar's manipulations has led to the destruction of Humanity, even as the Cylons are wiping out the fleet.
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* ''Series/BattlestarGalactica1978'' in its premiere episode has President Adar moaning at how his gullible stupidity falling for Baltar's manipulations has led to the destruction of Humanity, even as the Cylons are wiping out the fleet.
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* ''Series/BattlestarGalactica1978'' ''Series/BattlestarGalacticaClassic'' in its premiere episode has President Adar moaning at how his gullible stupidity falling for Baltar's manipulations has led to the destruction of Humanity, even as the Cylons are wiping out the fleet.
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* ''Series/BattlestarGalactica1978'' in its premiere episode has President Adar moaning at how his gullible stupidity falling for Baltar's manipulations has led to the destruction of Humanity, even as the Cylons are wiping out the fleet.
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** Series/{{Deep Space Nine}} episode "In the Pale Moonlight" is wholly dedicated to it. Sisko gives an account of his part in [[spoiler:Starfleet]]'s plan to [[spoiler:deceive the Romulans into joining the war against the Dominion]]. Sisko damns every amoral action he takes to carry out the plan, which [[spoiler: drags a neutral power into war and will cause the death of thousands or even millions who would have lived]]. Partially averted at the end where he declares that while he feels terrible for what he's done [[IDiDWhatIHadtoDo it had to be done]] and that he'd do it again.
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* This is pretty much Uncle Phil's reaction at the end of ''Series/TheFreshPrinceOfBelAir'' episode, "Just Say Yo...", after a tearful and utterly remorseful Will admits to the family that the drugs that nearly killed Carlton was his, but that he had been given them by someone else due to the stresses he had with his job, school and sports wiping him out and just put them in his locker. Phil's reaction was this because he realized Will was right mere moments before when he admitted he had the drugs, but never took him and he just embarrassed himself in front of the family for no real reason.
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* On ''{{Glee}}'', [[spoiler: when Sue goes into a deep depression,]] Will has a silent version of this, after a mild WhatTheHellHero from Kurt.
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* On ''{{Glee}}'', ''Series/{{Glee}}'', [[spoiler: when Sue goes into a deep depression,]] Will has a silent version of this, after a mild WhatTheHellHero from Kurt.
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** In the season 2 episode "Rumours", Artie is so frustrated and heartbroken by the possibility of Brittany, who [[ICantBelieveAGuyLikeYouWouldNoticeMe he never thought would even consider being in a relationship with him]], cheating on him with fellow cheerleader Santana, that he ends up accidentally calling her stupid, causing her to break up with him in tears. What follows is a musical version of this trope, as Artie lets his feelings pour out in a heartbreaking rendition of "[[https://www.youtube.com/watch?v=j-tNXLSjI_0 Never Going Back Again]]".
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* In the 1998 ''Film/{{Merlin}}'' series, Arthur has this reaction after Merlin calls him out for sleeping with Lady Marie, who was [[BrotherSisterIncest actually his half-sister]]. In the novelizations, this was taken up to full-blown HeroicBSOD that lasted for ''years.''
* In the ''Series/{{Merlin}}'' series, Arthur goes into this trope after killing a captured rival king in "His Father's Son".
* In the ''Series/{{Merlin}}'' series, Arthur goes into this trope after killing a captured rival king in "His Father's Son".
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* In the 1998 ''Film/{{Merlin}}'' ''Series/{{Merlin 1998}}'' series, Arthur has this reaction after Merlin calls him out for sleeping with Lady Marie, who was [[BrotherSisterIncest actually his half-sister]]. In the novelizations, this was taken up to full-blown HeroicBSOD that lasted for ''years.''
* In the''Series/{{Merlin}}'' ''Series/{{Merlin 2008}}'' series, Arthur goes into this trope after killing a captured rival king in "His Father's Son".
* In the
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* In the 13th episode of ''{{Dollhouse}}'' the NeuralImplanting technology has been weaponised and the United States has collapsed into anarchy after [[ChinaTakesOverTheWorld an attack from China]]. Topher, the scientist who helped develop the technology, is in his RoomFullOfCrazy and works out how it was done.
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* In the 13th episode of ''{{Dollhouse}}'' ''{{Series/Dollhouse}}'' the NeuralImplanting technology has been weaponised and the United States has collapsed into anarchy after [[ChinaTakesOverTheWorld an attack from China]]. Topher, the scientist who helped develop the technology, is in his RoomFullOfCrazy and works out how it was done.
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** Clarke has one when she sees the aftermath of a missile attack that she could have prevented, but chose to let happen anyway. Lexa might have had this reaction, too, but being TheStoic, it's hard to tell.
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* On ''Series/{{The 100}}'', Bellamy has this reaction when he finds out that, because he kept the Ark from finding out Earth is survivable, they executed 300 people to [[PopulationControl reduce their excess population]], rather than sending them to safety on Earth. When he does finally alert the Ark that they can survive on Earth, Kane (the man behind the mass execution) also has one of these, realizing that all the people he killed could have been saved if he'd only waited a few more days.
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* ''Series/StargateSG1'': [=Replicator!Carter=] seeks Carter's help to prevent a replicator army from invading Earth's galaxy, which has become immune to the Ancient disruptor. Carter trusts her because she believes no-one with her personality could ever work with Fifth. It's the only thing she's right about. [=Replicator!Carter's=] plan is to gain immunity to the disruptor, [[TheStarscream destroy Fifth]], distribute her immunity to the replicator army she's now take control of and establish a foothold in Earth's galaxy. Carter's shocked reaction is 'What have I done?'.
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* Also played for laughs in ''Series/{{Friends}}'': Chandler has his "nubbin" removed after a squicked-out date leaves him. He misses an obvious joke, then cites the nubbin as the source of his "powers." He then says "Oh dear God, what have I done?"
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** The Eleventh Doctor had one in "The God Complex". [[spoiler:A beast attacks his friends, and the Doctor thinks that it feeds on fear, so he tells them to focus on their faith. More people die much more rapidly after that, and Amy, his companion, is particularly affected. The Doctor realises that the monster doesn't feed on fear, but on faith. Since Amy basically sees him as a God, it's his love for him that will kill her. He breaks her faith with a ZeroApprovalGambit and unceremoniously drops her off at her house, planning to never speak to her again.]]
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** The Eleventh Doctor had one in "The God Complex". [[spoiler:A beast attacks his friends, and the Doctor thinks that it feeds on fear, so he tells them to focus on their faith. More people die much more rapidly after that, and Amy, his companion, is particularly affected. The Doctor realises that the monster doesn't feed on fear, but on faith. Since Amy basically sees him as a God, it's his love her adoration for him that will kill her. He breaks her faith with a ZeroApprovalGambit and unceremoniously drops her off at her house, planning to never speak to her again.]]
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** In another episode, this is essentially Fraiser's reaction upon fully realizing that he has successfully launched Woody Boyd's political career. (Cue visions of [[TheDeadliestMushroom atomic fireballs]].)
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** In another episode, this is essentially Fraiser's reaction upon fully realizing that he has successfully launched Woody Boyd's political career. (Cue visions of [[TheDeadliestMushroom [[UsefulNotes/NuclearWeapons atomic fireballs]].)
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* Brass had one on Series/{{CSI}} "Genetic Disorder", after spending the entire ep assuming Doc's wife really had cheated on him.
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* Brass had one on Series/{{CSI}} in the ''Series/{{CSI}}'' episode "Genetic Disorder", after spending the entire ep assuming Doc's wife really had cheated on him.
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* In ''[[Series/{{Mash}} M*A*S*H]]'', Father Mulcahey once impulsively punched out an unruly patient who hit him first during triage, when any delays in the selection process can cost lives. While the rest of the staff agree he was entitled, Father Mulcahey was kicking himself for some time afterward.
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* In ''[[Series/{{Mash}} M*A*S*H]]'', ''Series/{{MASH}}'', Father Mulcahey Mulcahy once impulsively punched out an unruly patient who hit him first during triage, when any delays in the selection process can cost lives. While the rest of the staff agree he was entitled, Father Mulcahey was kicking himself for some time afterward.
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** In the episode "O.R.", Frank Burns complains out loud about the difficulty he's having removing a wounded GI's kidney. On a hunch, Trapper goes over to look at the patient's x-ray...and shows Frank that the guy ''only has one kidney''. While Frank's borderline incompetence in surgery was usually PlayedForLaughs on the show, in this instance he's shown to be genuinely shaken at the realization that he could have killed the man through his carelessness.
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** In the episode "O.R.", Frank Burns complains out loud about the difficulty he's having removing a wounded GI's kidney. On a hunch, Trapper goes over to look at the patient's x-ray...X-ray... and shows Frank that the guy ''only has one kidney''. While Frank's borderline incompetence in surgery was is usually PlayedForLaughs on the show, in this instance he's shown to be genuinely shaken at the realization that he could have killed the man through his carelessness.
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** Angel, after he turned good again from being evil having [[spoiler: tried to kill Buffy multiple times, murdered Giles' girlfriend, and ALMOST banished the entire population of Earth to hell]] he was so wracked with guilt that it eventually caused the decision to leave Sunnydale forever, which in turn began his own spin-off series.
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** The most heartbreaking instance may be when G'kar, his longtime nemesis, accepts an official apology from the Centauri Emperor for crimes committed against the Narns and approaches Londo in good spirits, extending a tentative hand of friendship. The problem: [[spoiler:Londo made a deal with the Shadows only hours before that would result in another Narn-Centauri war]]. The look on Londo's face as he realizes his mistake is [[TearJerker Tear Jerking]].
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** The most heartbreaking instance may be when G'kar, his longtime nemesis, accepts an official apology from the Centauri Emperor for crimes committed against the Narns and [[ObliviousGuiltSlinging approaches Londo in good spirits, spirits]], extending a tentative hand of friendship. The problem: [[spoiler:Londo made a deal with the Shadows only hours before that would result in another Narn-Centauri war]]. The look on Londo's face as he realizes his mistake is [[TearJerker Tear Jerking]].
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* PlayedForLaughs in {{Smallville}}, ''Hypnotic'':
-->'''Chloe''': Oh my god, I just knocked out Martha Kent.
-->'''Lois''': [[ItMakesSenseInContext Hello, the woman is about to wallpaper her living room with my brain matter.]]
** More seriously in ''Identity'', [[spoiler:Chloe Sullivan]]'s horrified expression after [[spoiler:under the influence of {{Brainiac}}, she]] renders the bad guy of the week catatonic by overloading his brain with information to protect Clark.
** ''Stiletto'', when Chloe [[spoiler:dumps the body of the gangster Doomsday killed when he attacked her.]] She does this a lot...
** And in ''Sacrifice'', Zod's reaction when [[spoiler:he killed Faora. Along with her unborn child]].
* ''{{Cheers}}''. Carla once asked Frasier: "When you and Lilith wake up in the morning, which one of you is the first to scream, 'My God, what have I done?!'"
** In another episode, this is essentially Fraiser's reaction upon fully realizing that he has successfully launched Woody Boyd's political career. (Cue visions of [[TheDeadliestMushroom atomic fireballs]].)
** In Season One, Diane goes through a non-verbal version of this, after Coach and the others convince her to throw a baseball down the hall into the pool room, where Coach is standing. ItMakesSenseInContext--Coach is proving a point to her about his uncanny success at bunting...with his noggin. It's even worse for poor Diane when you consider that she fully expected to ''miss''--but as Sam notes, that's part of the point.
* ''Series/BuffyTheVampireSlayer'':
** Faith does this twice. First when she accidentally kills Alan Finch, screaming repeatedly "I didn't know!", and when she remembers what she did to Wesley and Buffy.
** This is also plainly evident in Willow's expression in "[[MusicalEpisode Once More With Feeling]]" when Buffy lets the Scoobies know that when they brought her back to life [[spoiler: they pulled her out of Heaven.]]
** Spike after the AttemptedRape in "Seeing Red". In a rather disturbing take on the trope, he seemed almost as distressed about his inability to go through with the act as he was by the fact he attempted it at all.
-->'''Spike:''' "What have I done? ... Why didn't I do it?"
** Anya utters this after her vengeance spell summons a spider which [[HeartTrauma rips out the hearts of 12 frat boys.]]
** Angel after the gypsy curse personifies this trope. He now believes he has to atone for what he has done.
** Buffy has this twice, once in Season 6, when she learns that she ''didn't'' come back wrong and has been doing all sorts of horrible stuff of her own free will, and again in Season 8 when Giles is killed, magic is destroyed, and the Slayer line is ended, as a result of her space frak with Angel.
* On the ''Series/{{Angel}}'' end is Gunn's epic version of this after his part in [[spoiler: Fred's death]].'
** And Wes's equally epic one after he went literally AxCrazy in "Billy". He was under a spell, but it didn't matter, he still hated himself.
** Wes also had one after he shot what he thought was his father in "Lineage".
* On Series/TheATeam: Face's expression after he pushes Murdock to the ground during their fight in ''Family Reunion'' borders on this. It's kind of a combination "What did I just do?" and confusion over the fact that Murdock doesn't seem the least bit angry with him for doing it.
* ''Series/ArrestedDevelopment'' uses a variation of this, "I've made a huge mistake". The phrase is used for comedic value, though. It was first said by GOB in "Key Decisions", and used by various characters afterwards, although it does remain primarily GOB's catchphrase, as he uses it at some point in most episodes.
* ''Series/BabylonFive'':
** Londo has several moments of serious regret as his schemes to restore Centauri power and glory play out... though that doesn't prevent him from going through with them [[spoiler: until matters reach the point where Centauri Prime itself is at risk of [[ApocalypseHow annihilation]]]].
** The most heartbreaking instance may be when G'kar, his longtime nemesis, accepts an official apology from the Centauri Emperor for crimes committed against the Narns and approaches Londo in good spirits, extending a tentative hand of friendship. The problem: [[spoiler:Londo made a deal with the Shadows only hours before that would result in another Narn-Centauri war]]. The look on Londo's face as he realizes his mistake is [[TearJerker Tear Jerking]].
** Londo gets a lot of these moments. In the same episode, when [[spoiler:the [[ReasonableAuthorityFigure Centauri Emperor]] is on his deathbed]], Londo tells him how [[spoiler:the Centauri have attacked a Narn colony, kicking off a terrible war to further the Centauri's expansionist ambitions]]. [[spoiler:The dying Emperor]] whispers his last words to Londo. Londo tells the other Centauri present that [[spoiler:the Emperor]] told him that he would want them to continue, and to "carry my people back to the stars". But what did he ''really'' say?
--->'''Londo:''' He said... ''That we are both damned.''
** Another instance of this happening to Londo (Seeing a pattern?) made it into latter season's credits, with Londo watching the [[spoiler: orbital bombardment of the Narn Homeworld with outlawed Mass Drivers]] [[http://youtu.be/bjIlqrAfbbg See Here.]] (spoilers, obviously)
** Also in that show is Delenn upon watching Dukhat die after being attacked by Earth Alliance warships orders their immediate destruction. "NO MERCY!" [[spoiler: When she calmed down she was horrified to learn that her actions had started a full-scale war.]]
** [[spoiler:Lennier]] had been struggling with his SubordinateExcuse for five seasons and finally gets his chance when [[spoiler:[[MurderTheHypotenuse Sheridan is accidentally trapped in a room filling with poisonous gas]]]]. [[MurderTheHypotenuse He walks away]], only to realize what he's doing moments later and runs back to [[spoiler:help Sheridan, only to find him rescued by others]].
** In the second season finale, Captain Sheridan gets one after he orders the station's defense grid to open fire on a Centauri cruiser in self-defense, resulting in the cruiser's swift destruction. Definitely justified, in that every action he had taken had been with the intent of protecting lives, rather than taking them, only for him to be backed up against the wall and only left with the one option. [[spoiler: He has a similar reaction midway through the third season when he does the same thing... to an Earth Alliance destroyer.]]
* ''Series/ICarly'': Freddie utters this line as a group (''What have WE done?'') when the gang realized that bringing back Marta made Lewbert's life even worse.
** Carly went into a breakdown of repentance in ''iChristmas'' when her wish turned her life into one she did not want.
** Freddie again evokes a variation of this trope in the extended version of ''iSaved Your Life''. After his break-up with Carly, his face changes expression while in the elevator and asks himself in regret, "What did I do?" Cue a zoom out of the Bushwell building as Freddie yells '''"WHAT DID I DO?!"'''
* The Carpenter has one in the SyFy miniseries ''Series/{{Alice|2009}}'', right after [[spoiler: breaking through his memory block and remembering his past life as Alice's father,]] then realizing it's a problem that he's spent the last ten years of his life sucking emotion juice out of people. [[spoiler: RedemptionEqualsDeath]]
* A 'My God, what have YOU done' moment happens at the end of the Peacekeeper Wars in ''Series/{{Farscape}}''. For four years people have been chasing John Crichton, killing, raping and attacking him and his friends for his wormhole knowledge, and he finally gives in and builds the thing to protect his wife and newborn child, and it turns out that wormhole weapons he's been telling everyone are horrific, galaxy destroying weapons that no one should ever have under any circumstances are actually just as bad as he always said they were. When he turns it on, even those most desperate to have them realise just how bad it is.
-->(The wormhole weapon has been fired, and threatens to consume the entire universe.)\\
'''Crichton:''' Here's how it lays out. Are you listening Stahleek? Grayza? Wormhole weapons do not make peace. Wormhole weapons do not even make war. They make total destruction, annihilation, Armageddon. ''People'' make peace."\\
'''Chiana:''' Crichton, can you stop it?\\
'''Crichton:''' I don't know, Pip. Maybe it eats the whole galaxy, a monumental black hole, a giant whirling headstone marking the spot where we all used to live and play and slaughter the innocent.\\
'''Scorpius:''' (softly) This is insane, Crichton.\\
(John lets out a choked laugh.)\\
'''Crichton:''' God! Four years on and you're ''finally'' getting that!
** A far more literal example is when Crichton has been forced to [[spoiler: kill Aeryn while possessed by the Neural Clone.]] In this case, Crichton really does say "My God, what have I done?"
* Jerry ''Series/{{Seinfeld}}'', after he gets engaged to Jeanie Steinem, a woman exactly like him...
--->I think I may have made a big mistake! All of the sudden I realized what the problem is! I can't be with someone like me! I hate myself!
* In ''Series/{{Battlestar Galactica|Reimagined}}'', Gaeta, during the [[spoiler: mutiny on Galactica in season 4. After Gaeta helps Zarek take over Galactica, Gaeta insists on giving Admiral Adama a court-martial for conspiring with the Rebel Cylons. But when Zarek has the [[MoralEventHorizon Quorum of Twelve gunned down]] for refusing to recognize him as President over Laura Roslin, Gaeta has a bit of a [[VillainousBSOD revelation]] while looking over their dead bodies.]]
-->[[spoiler: '''Gaeta:''' [[HeelRealization We--we had the truth on our side. Now... now]]...]]
-->[[spoiler: '''Zarek:''' [[WellIntentionedExtremist The truth is told by whoever is left standing]].]]
** Caprica Six realizes after her first resurrection that the Destruction of the Colonies was a ''huge'' mistake, and [[TheAtoner spends the rest of the series trying to make up for it]].
** Sharon (Boomer) [[spoiler:has a change of heart when she sees the experiments being done on Athena's daughter]].
** Baltar learns that he gave the Cylons information that helped them to kill billions of people.
** The ''original'' MyGodWhatHaveIDone moment, when Boomer finally 'regains consciousness' and sees the aftermath of her actions in the Season 1 finale. And the thematic continuation, the Season 4 premiere has [[spoiler: Tigh experience a sort of 'waking nightmare' where he imagines the consequences of not owning up to the horrible truth of what he believes himself to be -- killing Adama -- and is horrified by the thought]].
* ''Series/DoctorWho'':
** The Fifth Doctor had a few of these moments. Notably, check out [[Recap/DoctorWhoS21E1WarriorsOfTheDeep Warriors of the Deep]].
--->"There should have been another way."
** The DVD booklet notes also use the phrase ironically to refer to thestory's SpecialEffectFailure.
** The Ninth Doctor had one of these in "The Parting of the Ways", when he forcibly sends Rose back to her own time in the TARDIS to [[ItsNotYouItsMyEnemies protect her from the Daleks]], [[spoiler:only for her to absorb the power of ''the Time Vortex itself'' to get back and save him. He is truly distraught as it threatens to burn up her mind: "The power's gonna kill you, and it's ''my fault''!" He sacrifices his Ninth life to save hers.]]
*** The Ninth Doctor also had one of these in the previous episode, ''Bad Wolf'', where he looks down on a ruined Earth, populated by people who do nothing but watch horrific game shows and realises that it all happened due to his actions earlier in the series.
** The Tenth Doctor had one in "The Waters of Mars". [[spoiler:The Doctor saves people whose deaths will trigger the Golden Age of space exploration. He realises the impact of his interference when the key survivor realises what has happened and kills herself. The Doctor is subsequently horror-struck and has a massive HeelRealization.]]
*** The full force of this seems to finally hit him in "The End of Time";
--> '''Doctor''': I'm travelling alone for a bit. I ''thought'' it was better. But I [[HeroicBlueScreenOfDeath did]] [[JumpingOffTheSlipperySlope some]] [[AGodAmI things]]... ''[[YouCantFightFate it went wrong!]]''
** The Eleventh Doctor had one in "The God Complex". [[spoiler:A beast attacks his friends, and the Doctor thinks that it feeds on fear, so he tells them to focus on their faith. More people die much more rapidly after that, and Amy, his companion, is particularly affected. The Doctor realises that the monster doesn't feed on fear, but on faith. Since Amy basically sees him as a God, it's his love for him that will kill her. He breaks her faith with a ZeroApprovalGambit and unceremoniously drops her off at her house, planning to never speak to her again.]]
*** Amy Herself has one at the end of "The Impossible Astronaut", when she shoots someone in an astronaut suit who retracts its visor to reveal [[spoiler:a little girl.]]
* Parodied on ''Series/ChappellesShow'': after one of the "Moments in the Life of Little Jon", Chapelle goes off on a tangent about the rapper's song "Get Low", which contains the lyrics [[IntercourseWithYou "Aw skeet skeet skeet skeet skeet skeet!"]] He said the following:
-->'''Chapelle''': I'm like, you can't say skeet on the radio! You know what's so dope about skeet? ''White people don't know what it means yet.'' When they figure it out, they'll be like '''My God, what have we DONE?!'''
* ''Series/RobinHood'': Guy of Gisborne has this when he [[spoiler: kills Marian. This triggers his HeelFaceTurn.]]
* Curtis from sci-fi drama ''{{Misfits}}'' can sporadically turn back time and re-play certain events from his past whenever he has one of these moments. Of course, it [[ButterflyOfDoom doesn't always work out for the best]].
* Kat from ''PowerRangers'', when Rita's spell over her broke and she realized everything that she'd done to Kimberly.
** In the first season Tommy has one immediately after Rita's spell is broken. It is probably {{justified|Trope}} because he should be going into shock.
** Ransik says this in ''Series/PowerRangersTimeForce'', when his obsession with revenge on all humans causes him to hurt his daughter, the only person in the world he loved. In fact, he loved her enough to end his quest for vengeance after harming her.
* On ''{{Glee}}'', [[spoiler: when Sue goes into a deep depression,]] Will has a silent version of this, after a mild WhatTheHellHero from Kurt.
* In the 1998 ''Film/{{Merlin}}'' series, Arthur has this reaction after Merlin calls him out for sleeping with Lady Marie, who was [[BrotherSisterIncest actually his half-sister]]. In the novelizations, this was taken up to full-blown HeroicBSOD that lasted for ''years.''
* In the ''Series/{{Merlin}}'' series, Arthur goes into this trope after killing a captured rival king in "His Father's Son".
** Later in the series Guinevere is given an enchanted bracelet that rekindles her feelings for Lancelot and leads her to make-out with him on the eve of her wedding to Arthur. They're caught, and the trope is played out in a truly heart-rending manner. Since Gwen never discovers that she was enchanted, she honestly ''has no idea'' why she betrayed Arthur - she didn't want to, and she can't understand why she did. The question: "what have I done?" is taken quite literally.
* Michael from ''Series/PrisonBreak'' wonders this for having (indirectly) lead to several deaths.
* In an episode of ''Series/StrongMedicine,'' a boy comes into the hospital after having a police officer use a Taser on him (They later find out that the only reason he reacted so badly was because of mercury poisoning.) Lu then spends the entire episode going into an Ideological Screed against the female cop. Later on, another boy comes into the ER, with the same cop. She mentioned that she was chasing him and reached for her Taser, but hesitated. Lu began to praise her (and herself) for this, but then the cop mentioned that, because she hesitated, the boy ran out into traffic and got hit by a car. It was especially notable because Lu was a textbook JerkSue and CanonSue, so seeing her beliefs backfire was unique.
* In ''Series/{{Lost}}'', Jack has this reaction after finally [[spoiler: escaping from the island.]]
** "We have to go back!"
* ''Series/{{Star Trek|The Original Series}}'' had this:
** In "[[Recap/StarTrekS2E1AmokTime Amok Time]]", Spock, believing that he murdered Kirk, has this reaction so badly that he seemingly loses his will to live.
** In an episode of ''Series/StarTrekVoyager'', Torres utters this exact line when she realizes the race of robots she is helping were responsible for the extinction of their creators.
** Another from ''Voyager'' was the Doctor realizing that [[spoiler:he had disregarded his medical training and chosen to save his friend instead of someone he barely knew in a crisis situation. Being a medical program with a vast amount of ethical programming, he enters an almost literal HeroicBSOD over the matter.]]
*** To be clear: [[spoiler:There was ''no'' difference between the two cases from a medical standpoint, but he could only save one and he had to make a snap decision; it wasn't that his ethical programming failed so much as that he had never been programmed in how to make a decision where there was no obvious logic to indicate a correct choice (or, in fact, an obvious correct and incorrect choice). He didn't actually do anything wrong, he had the reaction anyway because he couldn't figure out a medical way to justify his decision.]]
* In ''Series/TheCloser'', after several episodes of not feeling any remorse for facilitating a VigilanteExecution the previous season and not taking the victim's family's lawsuit against the department seriously, Brenda finally breaks down sobbing "WhatHaveIDone?" at the end of season 7 episode 5, after everyone in her unit, plus Chief Pope, Commander Taylor, and her husband are all subpoenaed.
* On the third-season finale of ''Series/TheBigBangTheory'', Howard and Raj make an account for Sheldon on an online dating site. Sheldon gets matched with Amy Farrah Fowler, who is almost exactly like him. Howard's reaction when he sees the two together: "Good God, what have we done?"
* ''Series/ForeverKnight'''s Nick Knight has several of these over the course of the series, many in the flashbacks where he's struggling between needing to feed to survive and not wanting to kill.
* Brass had one on Series/{{CSI}} "Genetic Disorder", after spending the entire ep assuming Doc's wife really had cheated on him.
** In another episode, a husband and wife kill their baby after he starts showing symptoms of a degenerative disease that killed their first son. They find out after it's too late that he was simply sick because of the pesticide his mother used in the garden, and if she had stopped using it, he would have been perfectly healthy.
* Duncan on ''Series/{{Highlander}}'' after he [[spoiler: killed Richie in a demon-induced haze]]. His distress is so extreme that he immediately asks Methos to kill him.
* In Season 4 of ''Series/{{Heroes}}'', Samuel has this reaction after [[spoiler:murdering his brother, Joseph.]] He may or may not quote this trope by name, as Robert Knepper's well-done emotional performance makes it unclear whether he's saying "What have I done", or if he's begging [[spoiler:Joseph]] to "Hold on".
* In the ''Series/{{Charmed}}'' episode "We're Off to See the Wizard", Phoebe utters this almost verbatim after using pyrokinesis -- an upper-level demonic power -- on Cole's new personal assistant.
* In ''[[Series/{{Mash}} M*A*S*H]]'', Father Mulcahey once impulsively punched out an unruly patient who hit him first during triage, when any delays in the selection process can cost lives. While the rest of the staff agree he was entitled, Father Mulcahey was kicking himself for some time afterward.
** Hawkeye has this in the episode "Fallen Idol." He sends Radar to Seoul to "sow a few wild oats", and Radar subsequently gets wounded by enemy fire en route.
** In the episode "O.R.", Frank Burns complains out loud about the difficulty he's having removing a wounded GI's kidney. On a hunch, Trapper goes over to look at the patient's x-ray...and shows Frank that the guy ''only has one kidney''. While Frank's borderline incompetence in surgery was usually PlayedForLaughs on the show, in this instance he's shown to be genuinely shaken at the realization that he could have killed the man through his carelessness.
* In ''Series/GameOfThrones'', Theon Greyjoy silently has this reaction after looking back at everything he has done, taking Winterfell, [[spoiler: killing two orphan boys, then passing off their burnt corpses as those of Bran and Rickon.]] All because he wanted his fathers approval, but for him he already died in Kings Landing.
** This is written all over Ser Loras Tyrell's' face as he sits near [[spoiler:the corpse of King Renly Baratheon. He feels extremely guilty for convincing his lover to make a bid for the Iron Throne, as this path led to Renly becoming a target for assassination.]]
* Shane Vendrell from ''Series/TheShield'' gets a major one after [[spoiler:killing Curtis Lemansky]].
* ''Series/BreakingBad'':
** Jesse becomes depressive after [[spoiler: shooting Gale]]. He also blames himself for the heroin overdose of his girlfriend.
** After a deception allows Walter and Jesse to elude him, Hank is enraged to the point of severe PoliceBrutality against Jesse. After he calms down, he is visibly horrified at his actions.
** After nearly five whole seasons of rationalizations and selfish justifications, Walter finally goes through an absolutely gut-wrenching one [[spoiler:after kidnapping his baby daughter when he runs away from his wife and son after they turn on him. While he's taking care of her in a restroom, she says "Mama" and realizes, in that moment, that his actions over the course of the series have led to the destruction of his entire family, either through death or ruined lives. He tearfully has a phone conversation with Skyler where he acts like an abusive husband who threatened her to cooperate, in order to exonerate her to the police as well as to break ties with his family and leaves Holly at a fire station to be returned to Skyler.]]
* Miss O'Brien from ''DowntonAbbey'' is usually an unrepentant {{Jerkass}}, but when she [[spoiler: deliberately places a bar of soap so that Cora will slip on it, hoping that Cora will miscarry and be forced to keep employing her]], she looks at her reflection in the mirror while waiting for [[spoiler: Cora to get out of the bath]] and says "Sarah O'Brien, this is not who you are." After [[spoiler: Cora is injured and miscarries]], it's even worse.
* Each of the major character in ''Series/{{Supernatural}}'' have this reaction at one point.
** Sam after he finds out that by killing Lilith, [[spoiler: he actually released Lucifer, and that him drinking demon blood didn't actually increase his powers- it was simply a MagicFeather that Ruby used to control him.]]
** Dean after Alastair tells him that [[spoiler: by breaking and accepting his offer in Hell, he opened the first seal that started the apocalypse.]]
** Castiel after [[spoiler: deceiving his friends, teaming up with Crowley, breaking Sam's mind, absorbing all the souls in purgatory and going on one hell of a power binge.]]
* ''Series/SixHundredSixtySixParkAvenue'': Annie says this word for word when she realizes her way out of her deal with Gavin will lead to an innocent man's death.
* ''Series/NewsRadio'': In the episode "Who's The Boss (Part 1)", there's a scene where Beth is trying to fix the coffee machine (due to Joe the Handyman being on strike) while Dave (who is known to be a coffee addict) nervously waits for it to be fixed so he can have his cup of coffee. Beth believes she finally found what's wrong, but she instead causes the machine to short circuit, making the problem even worse. In horror, Dave shouts to Beth "My GOD, woman, what have you DONE?!"
* In one episode of the fifties run of ''Series/{{Dragnet}}'', the man who molested two four-year-old girls is horrified by what he's done.
* In a VerySpecialEpisode of ''BoyMeetsWorld'', Shawn has taken to drinking. His friends confront him and try to convince him to stop, citing his family history of alcoholism, but he rebuffs all their attempts until he shoves his girlfriend Angela into the door in anger. He is immediately appalled at this last action of his, even gasping "how did that just happen?" in horror afterwards, and it causes him to immediately stop drinking and seek help.
* As ''Series/WizardsOfWaverlyPlace'' is a show about magic, you bet your ass this trope is in use.
* In the 13th episode of ''{{Dollhouse}}'' the NeuralImplanting technology has been weaponised and the United States has collapsed into anarchy after [[ChinaTakesOverTheWorld an attack from China]]. Topher, the scientist who helped develop the technology, is in his RoomFullOfCrazy and works out how it was done.
-->'''Topher:''' An entire army in a single instant; that's all it takes. That's ''brilliant!'' [[WhyDidntIThinkOfThat Why didn't I think of that?]] ''(sees Adele's expression)'' Did I think of that? Did I? Oh god...oh my god...oh my god...
* ''Series/AirCrashInvestigation'':
** The air traffic controller in "Deadly Crossroads" has this reaction when he realizes he's just caused two planes to collide.
** After landing British Airways Flight 9, the crew pores over the flight records thinking they made a near-catastrophic mistake. Fortunately for them, they are not at fault.
* ''TheAndyGriffithShow'': Opie goes through this when he kills a bird. He ends up trying to make up for it by raising her babies until they're old enough to leave the nest.
* Juliette Barnes has this on ''Series/{{Nashville}}'' the morning after [[spoiler: she sleeps with [[{{Jerkass}} jerkass ex-boss]] Jeff Fordham]].
* Even Jeremy Clarkson utters one of these in ''Series/TopGear''. During the auction at which the trio bought their cars for the classic time-trial rally in Mallorca, he ends up overbidding for an Austin-Healey Sprite and only realises that he has to spend some of his own money on top of the initial budget ''after'' the auctioneer calls out his number and James tells him precisely how much he got the car for.
* In the ''Series/GetSomeIn'' episode "Medical", DrillSergeantNasty Corporal Marsh tells the aircraftmen under his instruction that they could all be dismissed from their two years' National Service if one of them commits suicide. When [=AC2=] Leckie comes in from being punished for making a few mistakes during drilling (having thus missed the earlier conversation), he says he would shoot himself if he had any ammunition for his rifle. The other airmen are intrigued by this and almost seem to egg him on. However, later that evening, they find Leckie and his rifle have vanished, and soon Marsh appears demanding to know why a round of live ammunition is missing from the armoury. The aircraftmen are left reflecting with horror on their inaction and even encouragement toward Leckie's suicidal thoughts... until he returns from a visit to the armoury where he learned how to avoid the mistakes for which Marsh punished him, and explains that the missing round of ammunition was just an arithmetic mistake.
----
-->'''Chloe''': Oh my god, I just knocked out Martha Kent.
-->'''Lois''': [[ItMakesSenseInContext Hello, the woman is about to wallpaper her living room with my brain matter.]]
** More seriously in ''Identity'', [[spoiler:Chloe Sullivan]]'s horrified expression after [[spoiler:under the influence of {{Brainiac}}, she]] renders the bad guy of the week catatonic by overloading his brain with information to protect Clark.
** ''Stiletto'', when Chloe [[spoiler:dumps the body of the gangster Doomsday killed when he attacked her.]] She does this a lot...
** And in ''Sacrifice'', Zod's reaction when [[spoiler:he killed Faora. Along with her unborn child]].
* ''{{Cheers}}''. Carla once asked Frasier: "When you and Lilith wake up in the morning, which one of you is the first to scream, 'My God, what have I done?!'"
** In another episode, this is essentially Fraiser's reaction upon fully realizing that he has successfully launched Woody Boyd's political career. (Cue visions of [[TheDeadliestMushroom atomic fireballs]].)
** In Season One, Diane goes through a non-verbal version of this, after Coach and the others convince her to throw a baseball down the hall into the pool room, where Coach is standing. ItMakesSenseInContext--Coach is proving a point to her about his uncanny success at bunting...with his noggin. It's even worse for poor Diane when you consider that she fully expected to ''miss''--but as Sam notes, that's part of the point.
* ''Series/BuffyTheVampireSlayer'':
** Faith does this twice. First when she accidentally kills Alan Finch, screaming repeatedly "I didn't know!", and when she remembers what she did to Wesley and Buffy.
** This is also plainly evident in Willow's expression in "[[MusicalEpisode Once More With Feeling]]" when Buffy lets the Scoobies know that when they brought her back to life [[spoiler: they pulled her out of Heaven.]]
** Spike after the AttemptedRape in "Seeing Red". In a rather disturbing take on the trope, he seemed almost as distressed about his inability to go through with the act as he was by the fact he attempted it at all.
-->'''Spike:''' "What have I done? ... Why didn't I do it?"
** Anya utters this after her vengeance spell summons a spider which [[HeartTrauma rips out the hearts of 12 frat boys.]]
** Angel after the gypsy curse personifies this trope. He now believes he has to atone for what he has done.
** Buffy has this twice, once in Season 6, when she learns that she ''didn't'' come back wrong and has been doing all sorts of horrible stuff of her own free will, and again in Season 8 when Giles is killed, magic is destroyed, and the Slayer line is ended, as a result of her space frak with Angel.
* On the ''Series/{{Angel}}'' end is Gunn's epic version of this after his part in [[spoiler: Fred's death]].'
** And Wes's equally epic one after he went literally AxCrazy in "Billy". He was under a spell, but it didn't matter, he still hated himself.
** Wes also had one after he shot what he thought was his father in "Lineage".
* On Series/TheATeam: Face's expression after he pushes Murdock to the ground during their fight in ''Family Reunion'' borders on this. It's kind of a combination "What did I just do?" and confusion over the fact that Murdock doesn't seem the least bit angry with him for doing it.
* ''Series/ArrestedDevelopment'' uses a variation of this, "I've made a huge mistake". The phrase is used for comedic value, though. It was first said by GOB in "Key Decisions", and used by various characters afterwards, although it does remain primarily GOB's catchphrase, as he uses it at some point in most episodes.
* ''Series/BabylonFive'':
** Londo has several moments of serious regret as his schemes to restore Centauri power and glory play out... though that doesn't prevent him from going through with them [[spoiler: until matters reach the point where Centauri Prime itself is at risk of [[ApocalypseHow annihilation]]]].
** The most heartbreaking instance may be when G'kar, his longtime nemesis, accepts an official apology from the Centauri Emperor for crimes committed against the Narns and approaches Londo in good spirits, extending a tentative hand of friendship. The problem: [[spoiler:Londo made a deal with the Shadows only hours before that would result in another Narn-Centauri war]]. The look on Londo's face as he realizes his mistake is [[TearJerker Tear Jerking]].
** Londo gets a lot of these moments. In the same episode, when [[spoiler:the [[ReasonableAuthorityFigure Centauri Emperor]] is on his deathbed]], Londo tells him how [[spoiler:the Centauri have attacked a Narn colony, kicking off a terrible war to further the Centauri's expansionist ambitions]]. [[spoiler:The dying Emperor]] whispers his last words to Londo. Londo tells the other Centauri present that [[spoiler:the Emperor]] told him that he would want them to continue, and to "carry my people back to the stars". But what did he ''really'' say?
--->'''Londo:''' He said... ''That we are both damned.''
** Another instance of this happening to Londo (Seeing a pattern?) made it into latter season's credits, with Londo watching the [[spoiler: orbital bombardment of the Narn Homeworld with outlawed Mass Drivers]] [[http://youtu.be/bjIlqrAfbbg See Here.]] (spoilers, obviously)
** Also in that show is Delenn upon watching Dukhat die after being attacked by Earth Alliance warships orders their immediate destruction. "NO MERCY!" [[spoiler: When she calmed down she was horrified to learn that her actions had started a full-scale war.]]
** [[spoiler:Lennier]] had been struggling with his SubordinateExcuse for five seasons and finally gets his chance when [[spoiler:[[MurderTheHypotenuse Sheridan is accidentally trapped in a room filling with poisonous gas]]]]. [[MurderTheHypotenuse He walks away]], only to realize what he's doing moments later and runs back to [[spoiler:help Sheridan, only to find him rescued by others]].
** In the second season finale, Captain Sheridan gets one after he orders the station's defense grid to open fire on a Centauri cruiser in self-defense, resulting in the cruiser's swift destruction. Definitely justified, in that every action he had taken had been with the intent of protecting lives, rather than taking them, only for him to be backed up against the wall and only left with the one option. [[spoiler: He has a similar reaction midway through the third season when he does the same thing... to an Earth Alliance destroyer.]]
* ''Series/ICarly'': Freddie utters this line as a group (''What have WE done?'') when the gang realized that bringing back Marta made Lewbert's life even worse.
** Carly went into a breakdown of repentance in ''iChristmas'' when her wish turned her life into one she did not want.
** Freddie again evokes a variation of this trope in the extended version of ''iSaved Your Life''. After his break-up with Carly, his face changes expression while in the elevator and asks himself in regret, "What did I do?" Cue a zoom out of the Bushwell building as Freddie yells '''"WHAT DID I DO?!"'''
* The Carpenter has one in the SyFy miniseries ''Series/{{Alice|2009}}'', right after [[spoiler: breaking through his memory block and remembering his past life as Alice's father,]] then realizing it's a problem that he's spent the last ten years of his life sucking emotion juice out of people. [[spoiler: RedemptionEqualsDeath]]
* A 'My God, what have YOU done' moment happens at the end of the Peacekeeper Wars in ''Series/{{Farscape}}''. For four years people have been chasing John Crichton, killing, raping and attacking him and his friends for his wormhole knowledge, and he finally gives in and builds the thing to protect his wife and newborn child, and it turns out that wormhole weapons he's been telling everyone are horrific, galaxy destroying weapons that no one should ever have under any circumstances are actually just as bad as he always said they were. When he turns it on, even those most desperate to have them realise just how bad it is.
-->(The wormhole weapon has been fired, and threatens to consume the entire universe.)\\
'''Crichton:''' Here's how it lays out. Are you listening Stahleek? Grayza? Wormhole weapons do not make peace. Wormhole weapons do not even make war. They make total destruction, annihilation, Armageddon. ''People'' make peace."\\
'''Chiana:''' Crichton, can you stop it?\\
'''Crichton:''' I don't know, Pip. Maybe it eats the whole galaxy, a monumental black hole, a giant whirling headstone marking the spot where we all used to live and play and slaughter the innocent.\\
'''Scorpius:''' (softly) This is insane, Crichton.\\
(John lets out a choked laugh.)\\
'''Crichton:''' God! Four years on and you're ''finally'' getting that!
** A far more literal example is when Crichton has been forced to [[spoiler: kill Aeryn while possessed by the Neural Clone.]] In this case, Crichton really does say "My God, what have I done?"
* Jerry ''Series/{{Seinfeld}}'', after he gets engaged to Jeanie Steinem, a woman exactly like him...
--->I think I may have made a big mistake! All of the sudden I realized what the problem is! I can't be with someone like me! I hate myself!
* In ''Series/{{Battlestar Galactica|Reimagined}}'', Gaeta, during the [[spoiler: mutiny on Galactica in season 4. After Gaeta helps Zarek take over Galactica, Gaeta insists on giving Admiral Adama a court-martial for conspiring with the Rebel Cylons. But when Zarek has the [[MoralEventHorizon Quorum of Twelve gunned down]] for refusing to recognize him as President over Laura Roslin, Gaeta has a bit of a [[VillainousBSOD revelation]] while looking over their dead bodies.]]
-->[[spoiler: '''Gaeta:''' [[HeelRealization We--we had the truth on our side. Now... now]]...]]
-->[[spoiler: '''Zarek:''' [[WellIntentionedExtremist The truth is told by whoever is left standing]].]]
** Caprica Six realizes after her first resurrection that the Destruction of the Colonies was a ''huge'' mistake, and [[TheAtoner spends the rest of the series trying to make up for it]].
** Sharon (Boomer) [[spoiler:has a change of heart when she sees the experiments being done on Athena's daughter]].
** Baltar learns that he gave the Cylons information that helped them to kill billions of people.
** The ''original'' MyGodWhatHaveIDone moment, when Boomer finally 'regains consciousness' and sees the aftermath of her actions in the Season 1 finale. And the thematic continuation, the Season 4 premiere has [[spoiler: Tigh experience a sort of 'waking nightmare' where he imagines the consequences of not owning up to the horrible truth of what he believes himself to be -- killing Adama -- and is horrified by the thought]].
* ''Series/DoctorWho'':
** The Fifth Doctor had a few of these moments. Notably, check out [[Recap/DoctorWhoS21E1WarriorsOfTheDeep Warriors of the Deep]].
--->"There should have been another way."
** The DVD booklet notes also use the phrase ironically to refer to thestory's SpecialEffectFailure.
** The Ninth Doctor had one of these in "The Parting of the Ways", when he forcibly sends Rose back to her own time in the TARDIS to [[ItsNotYouItsMyEnemies protect her from the Daleks]], [[spoiler:only for her to absorb the power of ''the Time Vortex itself'' to get back and save him. He is truly distraught as it threatens to burn up her mind: "The power's gonna kill you, and it's ''my fault''!" He sacrifices his Ninth life to save hers.]]
*** The Ninth Doctor also had one of these in the previous episode, ''Bad Wolf'', where he looks down on a ruined Earth, populated by people who do nothing but watch horrific game shows and realises that it all happened due to his actions earlier in the series.
** The Tenth Doctor had one in "The Waters of Mars". [[spoiler:The Doctor saves people whose deaths will trigger the Golden Age of space exploration. He realises the impact of his interference when the key survivor realises what has happened and kills herself. The Doctor is subsequently horror-struck and has a massive HeelRealization.]]
*** The full force of this seems to finally hit him in "The End of Time";
--> '''Doctor''': I'm travelling alone for a bit. I ''thought'' it was better. But I [[HeroicBlueScreenOfDeath did]] [[JumpingOffTheSlipperySlope some]] [[AGodAmI things]]... ''[[YouCantFightFate it went wrong!]]''
** The Eleventh Doctor had one in "The God Complex". [[spoiler:A beast attacks his friends, and the Doctor thinks that it feeds on fear, so he tells them to focus on their faith. More people die much more rapidly after that, and Amy, his companion, is particularly affected. The Doctor realises that the monster doesn't feed on fear, but on faith. Since Amy basically sees him as a God, it's his love for him that will kill her. He breaks her faith with a ZeroApprovalGambit and unceremoniously drops her off at her house, planning to never speak to her again.]]
*** Amy Herself has one at the end of "The Impossible Astronaut", when she shoots someone in an astronaut suit who retracts its visor to reveal [[spoiler:a little girl.]]
* Parodied on ''Series/ChappellesShow'': after one of the "Moments in the Life of Little Jon", Chapelle goes off on a tangent about the rapper's song "Get Low", which contains the lyrics [[IntercourseWithYou "Aw skeet skeet skeet skeet skeet skeet!"]] He said the following:
-->'''Chapelle''': I'm like, you can't say skeet on the radio! You know what's so dope about skeet? ''White people don't know what it means yet.'' When they figure it out, they'll be like '''My God, what have we DONE?!'''
* ''Series/RobinHood'': Guy of Gisborne has this when he [[spoiler: kills Marian. This triggers his HeelFaceTurn.]]
* Curtis from sci-fi drama ''{{Misfits}}'' can sporadically turn back time and re-play certain events from his past whenever he has one of these moments. Of course, it [[ButterflyOfDoom doesn't always work out for the best]].
* Kat from ''PowerRangers'', when Rita's spell over her broke and she realized everything that she'd done to Kimberly.
** In the first season Tommy has one immediately after Rita's spell is broken. It is probably {{justified|Trope}} because he should be going into shock.
** Ransik says this in ''Series/PowerRangersTimeForce'', when his obsession with revenge on all humans causes him to hurt his daughter, the only person in the world he loved. In fact, he loved her enough to end his quest for vengeance after harming her.
* On ''{{Glee}}'', [[spoiler: when Sue goes into a deep depression,]] Will has a silent version of this, after a mild WhatTheHellHero from Kurt.
* In the 1998 ''Film/{{Merlin}}'' series, Arthur has this reaction after Merlin calls him out for sleeping with Lady Marie, who was [[BrotherSisterIncest actually his half-sister]]. In the novelizations, this was taken up to full-blown HeroicBSOD that lasted for ''years.''
* In the ''Series/{{Merlin}}'' series, Arthur goes into this trope after killing a captured rival king in "His Father's Son".
** Later in the series Guinevere is given an enchanted bracelet that rekindles her feelings for Lancelot and leads her to make-out with him on the eve of her wedding to Arthur. They're caught, and the trope is played out in a truly heart-rending manner. Since Gwen never discovers that she was enchanted, she honestly ''has no idea'' why she betrayed Arthur - she didn't want to, and she can't understand why she did. The question: "what have I done?" is taken quite literally.
* Michael from ''Series/PrisonBreak'' wonders this for having (indirectly) lead to several deaths.
* In an episode of ''Series/StrongMedicine,'' a boy comes into the hospital after having a police officer use a Taser on him (They later find out that the only reason he reacted so badly was because of mercury poisoning.) Lu then spends the entire episode going into an Ideological Screed against the female cop. Later on, another boy comes into the ER, with the same cop. She mentioned that she was chasing him and reached for her Taser, but hesitated. Lu began to praise her (and herself) for this, but then the cop mentioned that, because she hesitated, the boy ran out into traffic and got hit by a car. It was especially notable because Lu was a textbook JerkSue and CanonSue, so seeing her beliefs backfire was unique.
* In ''Series/{{Lost}}'', Jack has this reaction after finally [[spoiler: escaping from the island.]]
** "We have to go back!"
* ''Series/{{Star Trek|The Original Series}}'' had this:
** In "[[Recap/StarTrekS2E1AmokTime Amok Time]]", Spock, believing that he murdered Kirk, has this reaction so badly that he seemingly loses his will to live.
** In an episode of ''Series/StarTrekVoyager'', Torres utters this exact line when she realizes the race of robots she is helping were responsible for the extinction of their creators.
** Another from ''Voyager'' was the Doctor realizing that [[spoiler:he had disregarded his medical training and chosen to save his friend instead of someone he barely knew in a crisis situation. Being a medical program with a vast amount of ethical programming, he enters an almost literal HeroicBSOD over the matter.]]
*** To be clear: [[spoiler:There was ''no'' difference between the two cases from a medical standpoint, but he could only save one and he had to make a snap decision; it wasn't that his ethical programming failed so much as that he had never been programmed in how to make a decision where there was no obvious logic to indicate a correct choice (or, in fact, an obvious correct and incorrect choice). He didn't actually do anything wrong, he had the reaction anyway because he couldn't figure out a medical way to justify his decision.]]
* In ''Series/TheCloser'', after several episodes of not feeling any remorse for facilitating a VigilanteExecution the previous season and not taking the victim's family's lawsuit against the department seriously, Brenda finally breaks down sobbing "WhatHaveIDone?" at the end of season 7 episode 5, after everyone in her unit, plus Chief Pope, Commander Taylor, and her husband are all subpoenaed.
* On the third-season finale of ''Series/TheBigBangTheory'', Howard and Raj make an account for Sheldon on an online dating site. Sheldon gets matched with Amy Farrah Fowler, who is almost exactly like him. Howard's reaction when he sees the two together: "Good God, what have we done?"
* ''Series/ForeverKnight'''s Nick Knight has several of these over the course of the series, many in the flashbacks where he's struggling between needing to feed to survive and not wanting to kill.
* Brass had one on Series/{{CSI}} "Genetic Disorder", after spending the entire ep assuming Doc's wife really had cheated on him.
** In another episode, a husband and wife kill their baby after he starts showing symptoms of a degenerative disease that killed their first son. They find out after it's too late that he was simply sick because of the pesticide his mother used in the garden, and if she had stopped using it, he would have been perfectly healthy.
* Duncan on ''Series/{{Highlander}}'' after he [[spoiler: killed Richie in a demon-induced haze]]. His distress is so extreme that he immediately asks Methos to kill him.
* In Season 4 of ''Series/{{Heroes}}'', Samuel has this reaction after [[spoiler:murdering his brother, Joseph.]] He may or may not quote this trope by name, as Robert Knepper's well-done emotional performance makes it unclear whether he's saying "What have I done", or if he's begging [[spoiler:Joseph]] to "Hold on".
* In the ''Series/{{Charmed}}'' episode "We're Off to See the Wizard", Phoebe utters this almost verbatim after using pyrokinesis -- an upper-level demonic power -- on Cole's new personal assistant.
* In ''[[Series/{{Mash}} M*A*S*H]]'', Father Mulcahey once impulsively punched out an unruly patient who hit him first during triage, when any delays in the selection process can cost lives. While the rest of the staff agree he was entitled, Father Mulcahey was kicking himself for some time afterward.
** Hawkeye has this in the episode "Fallen Idol." He sends Radar to Seoul to "sow a few wild oats", and Radar subsequently gets wounded by enemy fire en route.
** In the episode "O.R.", Frank Burns complains out loud about the difficulty he's having removing a wounded GI's kidney. On a hunch, Trapper goes over to look at the patient's x-ray...and shows Frank that the guy ''only has one kidney''. While Frank's borderline incompetence in surgery was usually PlayedForLaughs on the show, in this instance he's shown to be genuinely shaken at the realization that he could have killed the man through his carelessness.
* In ''Series/GameOfThrones'', Theon Greyjoy silently has this reaction after looking back at everything he has done, taking Winterfell, [[spoiler: killing two orphan boys, then passing off their burnt corpses as those of Bran and Rickon.]] All because he wanted his fathers approval, but for him he already died in Kings Landing.
** This is written all over Ser Loras Tyrell's' face as he sits near [[spoiler:the corpse of King Renly Baratheon. He feels extremely guilty for convincing his lover to make a bid for the Iron Throne, as this path led to Renly becoming a target for assassination.]]
* Shane Vendrell from ''Series/TheShield'' gets a major one after [[spoiler:killing Curtis Lemansky]].
* ''Series/BreakingBad'':
** Jesse becomes depressive after [[spoiler: shooting Gale]]. He also blames himself for the heroin overdose of his girlfriend.
** After a deception allows Walter and Jesse to elude him, Hank is enraged to the point of severe PoliceBrutality against Jesse. After he calms down, he is visibly horrified at his actions.
** After nearly five whole seasons of rationalizations and selfish justifications, Walter finally goes through an absolutely gut-wrenching one [[spoiler:after kidnapping his baby daughter when he runs away from his wife and son after they turn on him. While he's taking care of her in a restroom, she says "Mama" and realizes, in that moment, that his actions over the course of the series have led to the destruction of his entire family, either through death or ruined lives. He tearfully has a phone conversation with Skyler where he acts like an abusive husband who threatened her to cooperate, in order to exonerate her to the police as well as to break ties with his family and leaves Holly at a fire station to be returned to Skyler.]]
* Miss O'Brien from ''DowntonAbbey'' is usually an unrepentant {{Jerkass}}, but when she [[spoiler: deliberately places a bar of soap so that Cora will slip on it, hoping that Cora will miscarry and be forced to keep employing her]], she looks at her reflection in the mirror while waiting for [[spoiler: Cora to get out of the bath]] and says "Sarah O'Brien, this is not who you are." After [[spoiler: Cora is injured and miscarries]], it's even worse.
* Each of the major character in ''Series/{{Supernatural}}'' have this reaction at one point.
** Sam after he finds out that by killing Lilith, [[spoiler: he actually released Lucifer, and that him drinking demon blood didn't actually increase his powers- it was simply a MagicFeather that Ruby used to control him.]]
** Dean after Alastair tells him that [[spoiler: by breaking and accepting his offer in Hell, he opened the first seal that started the apocalypse.]]
** Castiel after [[spoiler: deceiving his friends, teaming up with Crowley, breaking Sam's mind, absorbing all the souls in purgatory and going on one hell of a power binge.]]
* ''Series/SixHundredSixtySixParkAvenue'': Annie says this word for word when she realizes her way out of her deal with Gavin will lead to an innocent man's death.
* ''Series/NewsRadio'': In the episode "Who's The Boss (Part 1)", there's a scene where Beth is trying to fix the coffee machine (due to Joe the Handyman being on strike) while Dave (who is known to be a coffee addict) nervously waits for it to be fixed so he can have his cup of coffee. Beth believes she finally found what's wrong, but she instead causes the machine to short circuit, making the problem even worse. In horror, Dave shouts to Beth "My GOD, woman, what have you DONE?!"
* In one episode of the fifties run of ''Series/{{Dragnet}}'', the man who molested two four-year-old girls is horrified by what he's done.
* In a VerySpecialEpisode of ''BoyMeetsWorld'', Shawn has taken to drinking. His friends confront him and try to convince him to stop, citing his family history of alcoholism, but he rebuffs all their attempts until he shoves his girlfriend Angela into the door in anger. He is immediately appalled at this last action of his, even gasping "how did that just happen?" in horror afterwards, and it causes him to immediately stop drinking and seek help.
* As ''Series/WizardsOfWaverlyPlace'' is a show about magic, you bet your ass this trope is in use.
* In the 13th episode of ''{{Dollhouse}}'' the NeuralImplanting technology has been weaponised and the United States has collapsed into anarchy after [[ChinaTakesOverTheWorld an attack from China]]. Topher, the scientist who helped develop the technology, is in his RoomFullOfCrazy and works out how it was done.
-->'''Topher:''' An entire army in a single instant; that's all it takes. That's ''brilliant!'' [[WhyDidntIThinkOfThat Why didn't I think of that?]] ''(sees Adele's expression)'' Did I think of that? Did I? Oh god...oh my god...oh my god...
* ''Series/AirCrashInvestigation'':
** The air traffic controller in "Deadly Crossroads" has this reaction when he realizes he's just caused two planes to collide.
** After landing British Airways Flight 9, the crew pores over the flight records thinking they made a near-catastrophic mistake. Fortunately for them, they are not at fault.
* ''TheAndyGriffithShow'': Opie goes through this when he kills a bird. He ends up trying to make up for it by raising her babies until they're old enough to leave the nest.
* Juliette Barnes has this on ''Series/{{Nashville}}'' the morning after [[spoiler: she sleeps with [[{{Jerkass}} jerkass ex-boss]] Jeff Fordham]].
* Even Jeremy Clarkson utters one of these in ''Series/TopGear''. During the auction at which the trio bought their cars for the classic time-trial rally in Mallorca, he ends up overbidding for an Austin-Healey Sprite and only realises that he has to spend some of his own money on top of the initial budget ''after'' the auctioneer calls out his number and James tells him precisely how much he got the car for.
* In the ''Series/GetSomeIn'' episode "Medical", DrillSergeantNasty Corporal Marsh tells the aircraftmen under his instruction that they could all be dismissed from their two years' National Service if one of them commits suicide. When [=AC2=] Leckie comes in from being punished for making a few mistakes during drilling (having thus missed the earlier conversation), he says he would shoot himself if he had any ammunition for his rifle. The other airmen are intrigued by this and almost seem to egg him on. However, later that evening, they find Leckie and his rifle have vanished, and soon Marsh appears demanding to know why a round of live ammunition is missing from the armoury. The aircraftmen are left reflecting with horror on their inaction and even encouragement toward Leckie's suicidal thoughts... until he returns from a visit to the armoury where he learned how to avoid the mistakes for which Marsh punished him, and explains that the missing round of ammunition was just an arithmetic mistake.
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