For ten years, Boulder residents have staged a spontaneous "naked pumpkin run" on Halloween, in which dozens of runners (150 last year) don only shoes and a pumpkin on their head, then jog a four-block route through the city.
This year, however, Boulder police put an end to the revelry, stationing 40 cops and two SWAT teams along the route, which police chief Mark Beckner promising that anyone showing their, er, treats would land on the state's sex offender list.
Looks like it worked. Just a few people did the run this year, and with sufficient clothing to ward off an arrest.
(Thanks to Sean McMahon for the tip.)