This is Why You Film Police: Cellphone Video Exposes Raging Cop Bashing Faces for No Reason

In a video uploaded to Facebook last year, Chicago Police officers were seen violently tossing a woman around,  attacking a man, and inciting general chaos- in typical police fashion.

The video begins with officers standing around with their chests puffed out, while a witness brilliantly reminds everyone not to talk, just to film.

Next thing we know a woman is having her face slammed into the hood of a cop car. That woman is Lisa Simmons, she was one of many community residents participating in a block party celebrating two of its artists signing a big recording contract.