Beyonce's sister Solange Knowles attacks Jay Z: What inspired the elevator brawl?

jay-z-solange-knowles-elevator-brawl.jpg It's the slap seen 'round the world.

The internet went nuts on Monday (May 12) when TMZ obtained video of Solange Knowles physically attacking her older sister Beyonce's husband Jay Z in an elevator at a Met Gala after party in NYC last week. 

The video, over two minutes long, doesn't have sound, but it's pretty clear what went down between the in-laws. Solange angrily points in Jay Z's face, yelling at him for the entire ride, and at a few points even goes absolutely bananas and kicks, punches, slaps and hits him while Beyonce calmly stands to the side and watches. Jay Z doesn't attack back, and only defends himself by grabbing Solange's foot when she starts kicking him.

The fourth person in the elevator is presumably a bodyguard who does his best to restrain Solange, and even hits the emergency stop button on the elevator more than a few times ... probably to try and keep the altercation private, but TMZ pretty much rendered that a moot point.

Watch the security video of the elevator brawl below:



So here's the question of the day: What on earth did Jay Z say to Solange that set her off in the first place? A source tells Us Weekly that "Solange flipped out over something Jay had said, that she took the wrong way. She took it too hard or too far. Not sure what it was, but she greatly overreacted."

Since neither Jay Z nor Solange's reps are commenting on the story, Zap2it brainstormed a few ideas over what offensive thing Jay Z might have slipped to his sister-in-law that incited her to riot. Beware, TV fans: Major spoilers below might lead you to start attacking someone in an elevator, so proceed with caution.

Jay Z told Solange that ... NBC canceled "Community"

Jay Z told Solange that ... the Mother was dead

Jay Z told Solange that ... the "Losties" are all dead

Jay Z told Solange that ... The CW renewed "Beauty and the Beast" but canceled "The Carrie Diaries"

Jay Z told Solange that ... Ross is Rachel's baby daddy

Jay Z told Solange that ... Big comes to get Carrie in Paris

Jay Z told Solange ... who shot J.R.

Jay Z told Solange that ... Joffrey died

Jay Z told Solange ... what was in the box

Jay Z told Solange ... who killed Laura Palmer

Jay Z told Solange that ... she should just stay off Twitter if she doesn't want to be spoiled.
Photo/Video credit: Getty Images