I came across this article from the LA Time blog:
Two bike messengers saved the day for a Los Angeles man Monday when they chased a bike thief for five blocks downtown and then knocked him to the ground, causing him to flee, police said. Keep reading the article by clicking here
Having being a target of a bike theft myself, it kind of warms my heart to read about a foiled bike theft. The question is, would you chase down a bike thief even though the bike being stolen was not yours? I think I was riding with a group of buddies we would probably give chase, but not if I would be riding solo.