Unofficial pot holiday draws 10,000 to Boulder, Colo.

A student runs toward the police barrier on the Norlin Quad at the University of Colorado in Boulder, Colo., on Friday, April 20, 2012, at 4:20pm. He was run down by police and arrested after crossing the barrier. Police blocked off the quad to prevent a 420 marijuana smoke out. (AP Photo/Ed Andrieski)