Seems that the Critical Mass asshats are not content with blocking traffic...
Confusion, however, quickly turned to terror, she said, when the swarming cyclists began wildly circling around and then running into the sides of her Toyota van.
Filled with panic, Ferrando said, she started inching forward until coming to a stop at Post and Gough streets, where she was surrounded by bikers on all sides.
A biker in front blocked her as another biker began pounding on the windshield. Another was pounding on her window. Another pounded the other side.
"It seemed like they were using their bikes as weapons,'' Ferrando said. One of the bikers then threw his bike -- shattering the rear window and terrifying the young girls inside.
Given this is San Fransisco, the fact that it was a minivan and had children in it may have caused the violence. There is a history of intense hostility to those with kids in that city, and anything so intolerably domestic as a minivan will give some "progressives" the vapors.