Question! Someone please help!!! **spoilers**

I think it's because she was trying to build a case against him. Remember she and her friend go to the lawyer after the restaurant? The lawyer notifies her that the Marks family protects it's money by holding all the sons' money in a trust that is inaccessible to anyone who is not married to the son(s). The lawyer says something like "If you want a settlement, you're gonna have to think of a way to 'motivate' them".
That was MY interpretation of that whole waking-up-the-neighbors thing. I could be be wrong but I don't think he hit her.


"That's the last time you put a knife in me! Y'hear me??"

-Royal Tenenbaum

I think he might have had someone following her. Remember, when she says, "I had lunch with Lauren today," he replies, "What else did you do today?" And the next scene is her banging on the neighbor's window. I think he somehow knew that she saw an attorney about divorcing him.

Call me Katie. ;-)

It doesn't really matter why they got into a fight. Suffice to say they are arguing daily about anything and everything.

But specifically that night, seemed to me that he'd had someone following her, and he knew she'd been to a divorce lawyer. He also knew that she would've discovered, at lunch with a friend, that her card had been cut off. I imagine that he would fly off the handle about the divorce lawyer. Or it could've been her, angry about her cards being cut off.

But the point of the fight doesn't seem to be the point.