You know you want it, baby.

[DHBirr]

M Fnord wrote:

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nemonowan wrote:

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May I point out that Doug inadvertently changing a nickname retroactively is mildly unsettling?

Hazard wrote:

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Not retroactively. I think the Trio just didn't pay all that much attention to Luna, so it's pure luck they noticed the change in nickname just as it had happened.

It's not retroactive, but if you look at the timestamps either there's a date error or something weird is going on:

Doug meets Luna wrote:

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Wednesday, September 18, 1995, 6:15 PM

The kids monitor the Ravenclaw Massacree wrote:

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Wednesday, September 18, 1995, 7:32 PM

Ron notes that people've been calling Luna Shirley for a while now... where "a while" means approximately an hour? I suspect shenanigans.

It is retroactive ... sort of.  Note the way Hermione realizes that she can't recall when people switched from "Loony" to "Shirley" -- and Harry and Ron agree that it must've been before they got on the Express.  That was two weeks ago.  
Twonky was standing right there when Looney told Luna he officially dubbed her "Shirley" (and she accepted the name in a moderately formal manner).  I don't know why the house-elves might've taken that exchange as an instruction to alter time so that Luna hasn't been called "Loony" for some two weeks, but I can't at the moment see any other plausible mechanism for the change.  
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Big Brother is watching you.  And damn, you are so bloody BORING.