We were walking down Fillmore Street near the SFist Staff Writer Dickensian Workhouse just now, and in the time it took us to go from Page Street to Fillmore Street, we were passed by no fewer than five 22-Fillmore busses. The first was packed the gills, the last was predictably empty. It's obvious that busses travel in packs to avoid predators (thanks for that one, Chris!), and given recent happenings at the zoo, we certainly......