View source for Who Are You and What Did You Do to X?

{{trope}}
A stock phrase to invoke and/or parody the "[[Spot the Imposter]]" game, that happens when someone seems to act out of character. For comedy purpose, usually it's said when the "impostor" performs better than the original in some way.

Occasionally even happens to an actual impostor.

Sometimes this phrase can be used as a playful compliment when a character has undergone a makeover, either minor or radical.

A subtrope of [[OOC Is Serious Business]].

{{examples}}
== [[Anime]] and [[Manga]] ==
* ''[[Ranma ½]]'': At one point, Genma talks about him and Nodoka being [[Happily Married]]. Ranma doesn't believe it though.
{{quote|'''[[Jerkass|Genma]]:''' I carved this on our honeymoon. A memory of love.
'''[[Deadpan Snarker|Ranma]]:''' Who are you and what have you done with my father?}}

== [[Fan Works]] ==
* Frequently used in ''[[Harry Potter]]'' fanfics whenever Hermione Granger does anything that defies the [[Flanderization|Flanderized]] "homework martinet" characterization she gained in earlier fics.
* In the ''[[Undocumented Features]]'' story ''[http://www.eyrie.net/UF/FI/OOTR/TXT/12-federation/vol1.html The Order of the Rose "The Federation Lives Forever!"]'' there is a moment when notoriously slothful guitarist Yui Hirasawa of ''[[K-On!]]'' texts her much more industrious ''kohai'' Azusa Nakano one Saturday afternoon and invites her to come over and practice.  Azusa promptly texts back:
{{quote|<pre>FROM Azu-nyan <3
TO Yui-senpai

Who are you and how did you get
Yui-senpai's phone?</pre>}}
* When Akane apologizes to Ranma for the first time in the ''[[Ranma ½]]'' fic series ''[[Tales of Ranma and Ranko]]'', he asks her, "Are you really Akane?"

== [[Film]] ==
* From the 1997 [[Fran Drescher]] film ''[[The Beautician and the Beast]]'':
{{quote|'''Joy Miller:''' Who are you and what did you do with the little Nazi kid?}}

== [[Live-Action TV]] ==
* From the ''[[Gossip Girl]]'' episode "Hi, Society":
{{quote|'''Nate:''' Who are you and what did you do with Blair Waldorf?}}

== [[Music]] ==
* There's a [[filk]] song on this — ''[http://www.songworm.com/lyrics/songworm-parody/WhoAreYouAndWhatHaveYouDon.html Who Are You And What Have You Done With...]''

== [[Periodicals]] ==
*  ''[http://www.apa.org/gradpsych/2013/03/spouse.aspx Who are you, and what did you do with my spouse?]'', an article in the March 2013 issue of the American Psychological Association's ''gradPsych'' magazine.

== [[Web Comics]] ==
* ''[[Vexxarr]]'' with [http://www.vexxarr.com/archive.php?seldate=031207 Minionbot] and [http://www.vexxarr.com/archive.php?seldate=012611 Vexxarr himself]. "[http://www.vexxarr.com/archive.php?seldate=030212 We need to make sure you're really ''you''...]" And [http://www.vexxarr.com/archive.php?seldate=083017 Vexxarr again].
* ''[[Schlock Mercenary]]'' had [https://www.schlockmercenary.com/2010-06-27 this one]:
{{quote|'''Ennesby''': {{spoiler|In a TUX?}}  Where's Tagon, and what have you done with him?}}
** And "[https://www.schlockmercenary.com/2018-04-30 May I speak to the ''real'' Captain Landon?]" (minor spoilers).
* ''[[Girl Genius]]'', when [http://www.girlgeniusonline.com/comic.php?date=20140806 Dupree corners Gil] about the whole "acting out of character too much" thing (we already know he's under mind control, and some of other people dealing with him know or strongly suspect this).
** And in a less serious way, [http://www.girlgeniusonline.com/comic.php?date=20190722 Martellus].
* ''[[Questionable Content]]'' with [https://questionablecontent.net/view.php?comic=430 the real Pintsize], and [https://questionablecontent.net/view.php?comic=4047 the real Hannelore] (who used to be almost terminally germophobic and after a while improved to moderately germophobic, so it ''is'' out of character).
* ''[[Flaky Pastry]]'' [http://flakypastry.runningwithpencils.com/comic.php?strip_id=329 here]. Which is not entirely unreasonable, since [http://flakypastry.runningwithpencils.com/comic.php?strip_id=324 that]'s what caused the sudden change.

{{reflist}}

[[Category:Who Are You and What Did You Do to X?]]
[[Category:Stock Phrases]]
[[Category:Trope]]
[[Category:This Index Asked You a Question]]