Who Are You and What Did You Do to X?

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A stock phrase to invoke and/or parody "Spot the Imposter" game, that is, happens when someone seems to act out of character. For comedy purpose, usually it's said when the "impostor" performs better.

Occasionally even happens to an actual impostor.

Occasionally, 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 of Who Are You and What Did You Do to X? include:

Anime and Manga

• Ranma ½: At one point, Genma talks about him and Nodoka being Happily Married. Ranma doesn't believe it though.

Genma: I carved this on our honeymoon. A memory of love. Ranma: Who are you and what have you done with my father?

Fanfiction

• Frequently used in Harry Potter fanfics whenever Hermione Granger does anything that defies the Flanderized "homework martinet" characterization she gained in earlier fics.

Film - Live Action

• From the 1997 Fran Drescher film The Beautician and the Beast:

Joy Miller: Who are you and what did you do with the little Nazi kid?

Periodicals

• 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 Minionbot and Vexxarr himself. "We need to make sure you're really you..."
• Schlock Mercenary had this one:

Ennesby: In a TUX? Where's Tagon, and what have you done with him?

• Girl Genius, when 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).

Television

• From the Gossip Girl episode "Hi, Society":

Nate: Who are you and what did you do with Blair Waldorf?

Real Life

• A common phase related to this trope is "Who died (or left) and put you in change?"