Organizers expected 10,000 concertgoers but 20,000 showed up and began climbing roofs, throwing bottles and chairs and smashing people against the stage.
"People in the front started leaving because they were getting crushed," said witness Tamika Johnson.
The concert was part of the "Sounds Like Paper" series presented by Paper Magazine. After the NYPD dispersed the crowd at 7 p.m., the magazine gave the following statement on their site:
"Wow, the crowd was much larger than we anticipated, and unfortunately the show was canceled. But we will make it up to you guys!"
Two people were arrested on minor charges and six suffered minor injuries.
Watch the commotion in the clip (above).
We're just glad it didn't get any worse!