I thought Kristen Stewart was a boy at first

That's what a lot of people thought when this movie first came out. This message board and Kristen's was full of threads like this.

She was a handsome boy back then.

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I think we all did. She's an odd looking girl for sure!

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She look like the boy from those "Home Alone" movies.

I’ve noticed that Fincher likes androgynous women in his films, who are also strong and intelligent.

Ripley in Alien 3 - bald, butch and badass.
Helen Bonham Carter in Fight Club - looks like a 12 year old goth boy.
Rooney Mara in Dragon Tattoo - same thing, plus Lisbeth is bi.
Chloë Sevigny in Zodiac - heavy lesbian vibe.
Margot in Gone Girl - flat chested and with man glasses. Also behaves kinda dude-like, whereas the dumb bimbo has massive tits and is more traditionally ‘girly’.

But yeah, Stewart in Panic Room takes the cake - literally thought that was a dude until we heard ‘Sara’.

She still looks like a boy, which is why her closeted gay male fans post about her obsessively. “I’m not gay. She’s a girl.”

Sure she is.