We may never know for sure why Solange Knowles attacked her brother-in-law. Here are some top theories from around the web.
1. Solange Has a Drinking Problem
Many have pointed out that the fight took place at the end of a very long night of partying, and Solange may have been drunk at the time of the event. Reactions from those around her suggest this sort of thing happens often.
2. Jay Z Cheating Rumors Are True
Jay has been linked to a variety of up-and-coming pop stars recently. Could it be that the Carters are just keeping up appearances while Solange has grown tired of the charade?
3. Jay Z Had Been Breaking Up Solange's Fights All Night
Solange was reportedly spotted screaming at designer Rachel Roy earlier in the night. Some onlookers say Jay Z intervened. Was the elevator fight Solange's way of taking out her aggression.
4. Jay Z and Beyonce Are Having Marriage Problems
The way Beyonce seems to quietly accept and maybe even approve of Solange's attack on her husband has led many to believe the power couple is having problems. Was Solange simply standing up for Beyonce?
5. Jay Z Enjoys Pushing Solange's Buttons
Some have pointed out that Jay's body language in the security cam footage suggest he finds the attack humorous. The very few times Jay and Solange have been photographed together seem to suggest the in-laws aren't exactly close.