What started with just five guys running around in Boston back in the year 2000 has grown into an annual international event. Each December, men and women in cities around the world put on their Santa hats and strip down to their skimpy red underwear to participate in the Santa Speedo Run and raise money for local charities. We've compiled a gallery of images from speedo runs across the globe over the past 16 years. This year's run is scheduled for December 10.