Without knowing what or who else was in the room that could be reflected, what was across the street visible through the window, etc, there's no way to know how such an image could come about. Therefore it HAS to be a REAL GHOST!!!!!1111ONE!

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort