Solange isn’t very happy with her brother in law.

TMZ has acquired security footage from last week’s Met Gala, that shows Solange Knowlesferociously attacking Jay Z in a museum elevator, as Beyonce looks on and a bodyguard does his best to keep Bey’s sister from physically harming a reluctant Hov.

There’s no audio–though we wish there was–so there’s no way to know for certain what caused Solange to go off on Jay, or what was being said during the attack, but just by watching the clip (which is just under a minute), it’s clear Solange has some MAJOR anger towards Hov.