CHICAGO—In celebration of concussions, cerebral contusions, and other forms of blunt head trauma, bicyclists across the country removed their protective helmets Monday for National Head Injury Month. "It is an honor for me to commemorate this wonderful, wonderful month," said NHIM organizer John Harris, who made the announcement while simultaneously riding his bike, blasting Danzig-era Misfits on his iPod, and veering wildly in and out of traffic. "It is an honor for me commemorate this wonderful, wonderful month." Cyclists observe National Head Injury Month each May, immediately following their recognition in April of Flailing Uncontrollably Through the Air Month.