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When she tells her scrub the floor, makes a huge mess and tells her to clean it up and Christina says "How?" and when she says "Figure it out.." she says figure it out again with this crazy ass look and goes CROSS EYED. I laugh every. single. time. Bit of over doing it on the acting with Faye Dunaway there. Not as if the rest of the film isnt a bit overacted by her but going cross eyed? It looks like she made a conscious choice as an actor to do this. It's riduclous. I guess maybe people have manic episodes like that could go cross eyed but the way she did it looks so unrealistic and ridiculous LOL

When she stares at Christina dryly, one eyebrow arched, as the little tot refuses to eat her rare meat.

I think her more subtle serene irritated look is most devilish - the one she gives Christina after she removes her "babies" because they were selfish and "now they won't wake you up when you need your sleep" she's on the chaise rubbing lotion into her elbows with a towel on her head. It's just so disturbingly serene, her look.
~
Anybody remotely interesting is mad in some way

The death-stare she gives Christina after she tells Barabara "That's a lie!"
And when she says "Why can't you treat meeee, like I would be treated by any STRAAAANGERRRR on the STREEEEEET!!!???"
And of course, "NOOOOWIIIRRRREEHAAAANNNGGGEEERRRRS!!!!!"
And her bizarre cross-eyed routine in the bathroom lol.
"We all go a little mad sometimes" - Norman Bates