History ThrowItIn / WesternAnimation

* ''{{Freakazoid}}'''s voice actor was supposed to refuse a plot hook with a "No," and the sequence ended up twenty seconds longer because of [[http://www.youtube.com/watch?v=T_rP5SDvyKI what he did say.]]

* According to [[http://scifi.about.com/od/starwarstelevision/a/Star-Wars_Clone-Wars_Interview-With-Ashley-Eckstein.htm Ashley Eckstein]], she was asked to use an Icelandic accent for the voice of Ahsoka Tano in ''StarWarsTheCloneWars'', but when she came in with a practiced Icelandic accent, it apparently [[RealityIsUnrealistic wasn't what they expected]]. The voice she ended up getting told to do in the show is based on the tones in her ''real'' voice during the audition when she got frustrated that she couldn't figure out what accent they wanted.

** In the first episode, a pony in the background was given crossed eyes as a joke by an animator, and wasn't intended to be visible. Last minute changes moved a bunch of other characters out of the way, making this pony visible. Fans noticed, and were amused, leading to the pony being nicknamed "Derpy Hooves." The joke became so famous that the show's creator, Lauren Faust, said [[AscendedFanon "she can be Derpy if everyone likes."]] They also gave her the cross-eyed look in most other episodes she appeared in during season 1, and from season 2 on her appearances are fully scripted. She has since gone on to become one of the most beloved characters in the series and something of a mascot for the fanbase, with the [[http://www.derpibooru.org largest MLP image booru]] on the net being named after her.

* [[DarkActionGirl Shego]] from ''WesternAnimation/KimPossible'' was originally created as a generic, boring [[TheDragon Dragon]] to [[HarmlessVillain Dr. Drakken]], but after the creators heard Nicole Sullivan's performance as Shego they gave her a bigger role, making her [[DeadpanSnarker sarcastic]], [[HypercompetentSidekick more competent]] and far savvier than [[GeneralFailure Drakken]]. Today, [[EnsembleDarkhorse she's]] one of the show's most iconic characters.

** The Hamstergeddon episode involved Ultra Peepi swaggering down the street, not by intention. It came back from animation that way, and Jhonen loved it and had the composer make funk music to go under it. "I want to hear Barry White saying 'Ultra Peepi.'" Check it out [[http://www.youtube.com/watch?v=b7vnD5WQjsA here]].

** This was apparently par for the course -- [[CensorDecoy they'd include really extreme stuff to distract the Hays office so the stuff they really wanted in would scoot by, only for the Hays office to ignore the decoys and go for the real meat anyway.]]

* The episode "Shrabster" of ''{{Sealab 2021}}'' involves an [[LargeHam hammy, over the top]] announcer declaring "Indeed!" along with a linking remark with each scene change. The hammyness ultimately becomes too much for the announcer when leaving a clip involving [[BlackComedy a starving 14 year old African boy]].

** Lending to its realistically unpracticed and stumbling delivery, the Cloudsdale anthem as performed by Spike in "[[Recap/MyLittlePonyFriendshipIsMagicS4E24EquestriaGames Equestria Games]]" was [[https://twitter.com/CathyWeseluck/status/483786494260166656 genuine improvisation on Cathy Weseluck's part.]]
** The episode "[[Recap/MyLittlePonyFriendshipIsMagicS6E14StrangerThanFanFiction Stranger than Fan Fiction]]" featured [[InsufferableGenius Quibble Pants]] [[CreativeClosingCredits giving a monologue over the credits]] about the next ''Daring Do'' book. Creator/PattonOswalt, who voiced the character, improvised the whole thing.

* [[WordOfGod According to]] BruceTimm, Terry's revelation as [[spoiler: Bruce's biological son]] in ''WesternAnimation/BatmanBeyond'' and the ''JusticeLeagueUnlimited'' episode "Epilogue" stemmed from the earlier realization that, [[spoiler: with his established redhead and light-brunette parents]], Terry's black hair was genetically implausible. Apparently, [[WeWillNotUseStageMakeupInTheFuture We Will Not Use Hair Dye In The Future]].

* Megatron's famous "''[[VerbalTic yeeeeeeeessss...]]''" from ''WesternAnimation/BeastWars'' wasn't originally scripted, but was improvised by voice actor DavidKaye, who thought it fit the character. It did, and quickly became his CatchPhrase.

** Motor Ed was created because JohnDiMaggio was goofing around in the break room and made up the voice for a laugh.

* On ''WesternAnimation/TheSimpsons'', the often-quoted sung line: "I am so smart! I am so smart! S-M-R-T! I mean, S-M-A-R-T!" This was an actual mistake by voice actor Creator/DanCastellaneta, but it was just so "Homer" they left it in.

* ''HomeMovies'' is so improvised, you can hear the actors stuttering and trying to come up with a new line. The show's creators have noted that some fans were upset to find that the show was even loosely scripted--having plot points outlined, but leaving most dialogue to the actors.

** The 100th episode, was basically an admitted [[PanderingToTheBase Panderific]] shout out to the PeripheryDemographic, could have been called "Throw It In: The Episode" with all the ShipTeasing and AscendedFanon it indulged in. Most notably is the sea serpent who appeared in season 1 that was christened "Steven Magnet" by the fanbase after [[https://derpiboo.ru/79077 a borked Youtube Caption]], who was officially referred to as this in this episode[[note]]Though it was alluded to on some trading cards that described him as having a "magnetic" personality[[/note]].

** The first episode contains the line 'Invader's blood marches through my veins - like giant, radioactive rubber pants!' The line was supposed to say 'ants'. But it's the kind of show where "pants" actually fits ''better.''

* [[DarkActionGirl Shego]] from ''WesternAnimation/KimPossible'' was originally created as a generic, boring [[TheDragon Dragon]] to [[HarmlessVillain Dr. Drakken]], but after the creators heard Nicole Sullivan's performance as Shego they gave her a bigger role, making her [[DeadpanSnarker sarcastic]], [[HypercompetentSidekick more competent]] and [[DangerouslyGenreSavvy far savvier]] than [[GeneralFailure Drakken]]. Today, [[EnsembleDarkhorse she's]] one of the show's most iconic characters.

** In the first episode, a pony in the background was given crossed eyes as a joke by an animator, and wasn't intended to be visible. Last minute changes moved a bunch of other characters out of the way, making this pony visible. Fans noticed, and were amused, leading to the pony being nicknamed "Derpy Hooves." The joke became so famous that the show's creator, Lauren Faust, said [[AscendedFanon "she can be Derpy if everyone likes."]] They also gave her the cross-eyed look in most other episodes she appeared in during post-production in season 1 and from season 2 on her appearances are fully scripted. She has since gone on to become one of the most beloved characters in the series and something of a mascot for the fanbase, with the [[http://www.derpibooru.org largest MLP image booru]] on the net being named after her. Not bad at all for mistake.

** The 100th episode, basically being an admitted [[PanderingToTheBase Panderific]] shout out to the PeripheryDemographic, could have been called "Throw It In: The Episode" with all the ShipTeasing and AscendedFanon it indulged in. Most notably is the sea serpent who appeared in season 1 that was christened "Steven Magnet" by the fanbase after [[https://derpiboo.ru/79077 a borked Youtube Caption]], who was officially referred to as this in this episode[[note]]Though it was alluded to on some trading cards that described him as having a "magnetic" personality[[/note]].
** The melody in Applejack's Lullaby from "[[Recap/MyLittlePonyFriendshipIsMagicS5E4BloomAndGloom Bloom and Gloom]]" was improvised by Ashleigh Ball.

* Nick Bakay and Richard Steven Horvitz, respectively the voice actors for Norbert and Daggett on ''TheAngryBeavers'', improvised a lot of their dialogue as well.

** In the first episode, a pony in the background was given crossed eyes as a joke by an animator, and wasn't intended to be visible. Last minute changes moved a bunch of other characters out of the way, making this pony visible. Fans noticed, and were amused, leading to the pony being nicknamed "Derpy Hooves." The joke became so famous that the show's creator, Lauren Faust, said [[AscendedFanon "she can be Derpy if everyone likes."]]
*** They also gave her the cross-eyed look in most other episodes she appeared in during post-production in season 1. In season 2, her appearances are now fully scripted.

* A rather unhumourous example happened in ''WesternAnimation/TheRenAndStimpyShow Adult Party Cartoon'' spinoff that ultimately led to cancellation of the series. The episode "Onward and Upward" contained a graphic homosexual sex scene between the eponymous duo in the original run, added as a joke by an animator. Creator Creator/JohnKricfalusi explained that there was never supposed to be any actual sex in it, that Ren and Stimpy were supposed to be playing baseball under the sheets (as a part of a vague "pitcher and catcher" metaphor earlier in the episode). He claimed he wanted to cut it straight away, but he felt sorry for the animator who thought it was funny. The scene was left in and caused a minor uproar at an animation newsgroup, where a group of people [[TooDumbToLive thought Kricfalusi was trying to sabotage his own show]] - the executives at SpikeTV saw this conversation, thought that's the way everyone felt and cancelled the project. Go figure.

* A rather unhumourous example happened in ''TheRenAndStimpyShow Adult Party Cartoon'' spinoff that ultimately led to cancellation of the series. The episode "Onward and Upward" contained a graphic homosexual sex scene between the eponymous duo in the original run, added as a joke by an animator. Creator Creator/JohnKricfalusi explained that there was never supposed to be any actual sex in it, that Ren and Stimpy were supposed to be playing baseball under the sheets (as a part of a vague "pitcher and catcher" metaphor earlier in the episode). He claimed he wanted to cut it straight away, but he felt sorry for the animator who thought it was funny. The scene was left in and caused a minor uproar at an animation newsgroup, where a group of people [[TooDumbToLive thought Kricfalusi was trying to sabotage his own show]] - the executives at SpikeTV saw this conversation, thought that's the way everyone felt and cancelled the project. Go figure.

* In an episode of ''WesternAnimation/RickAndMorty'', the gang are watching a trailer for a movie called "Two Brothers". The voice actor for the narrator actually cracks up near the end over how goofy the idea is and they decided to leave it in.

** The creators accidentally [[OneSteveLimit gave two characters the last name "Wiggum:"]] the town's [[PoliceAreUseless idiotic police chief]] and one of Lisa's [[TheDitz unintelligent classmates]]. Actually, they're both dumb and kind of chubby...okay, they're father and son now.

** Lending to its realistically unpracticed and stumbling delivery, the Cloudsdale anthem as performed by Spike in ''[[Recap/MyLittlePonyFriendshipIsMagicS4E24EquestriaGames Equestria Games]]'' was [[https://twitter.com/CathyWeseluck/status/483786494260166656 genuine improvisation on Cathy Weseluck's part.]]

* ''InvaderZim''

* [[DarkActionGirl Shego]] from ''KimPossible'' was originally created as a generic, boring [[TheDragon Dragon]] to [[HarmlessVillain Dr. Drakken]], but after the creators heard Nicole Sullivan's performance as Shego they gave her a bigger role, making her [[DeadpanSnarker sarcastic]], [[HypercompetentSidekick more competent]] and [[DangerouslyGenreSavvy far savvier]] than [[GeneralFailure Drakken]]. Today, [[EnsembleDarkhorse she's]] one of the show's most iconic characters.

* In ''[[PixarShorts Knick Knack]]'', the "BlahBlahBlah" song during the credits was actually a result of vocalist Bobby [=McFerrin=] improvising. [=McFerrin=], a vocalist famous for his a cappella work, was hired by Pixar to compose and perform the soundtrack for the film. The work print he was given to compose over featured "blah blah blah" as a placeholder for the credits, and he ran with it. The folks at Pixar liked it so much that it made the final cut.

* ''WesternAnimation/{{Futurama}}'''s famous Hypno-Toad sound effect was meant to just be a placeholder until a proper sound effect could be edited in. However, the placeholder noise sounded "so wrong" that the creators decided to keep it.
** An in series example is where Calculon is showing the clip to a new episode of his show where he does a BigNo. He informs the talk show host he was actually supposed to say "yes" but kept it in.

** Well, his kid brother has the same hair, which would be harder to explain.