An estimated 1,000 people converged on Sunday at Berlin's Brandenburg Gate for a pillow fight flash mob as the city celebrated the transition from gray winter to sunny spring. "We're driving the winter away, bring your pillows along," organizers had written in an Internet posting. The mobsters not only had a good time -- they also left a large coating of feathers that could be seen across Pariser Platz, the square in front of the Brandenburg Gate, on Monday morning.