A spectacular end to a long day

So I'm waiting for the westbound 72 bus at Damen tonight, when I hear music and horns. I looked to my left and see a huge group of bicycles circling a cab in the middle of the interection like sharks goin' in for the kill. I continued to watch while traffic was at a standstill for a good 10-15 minutes. A cyclist broke off from the group and rested near us, which gave us all (staring in amazement) a chance to find out what was going on. I'm glad he did, or I wouldn't have learned about Critical Mass, or found this website. How great!