Danny Lesh noticed that his stolen bike ended up for sale on Craigslist. When police declined to intervene, Danny decided to take justice into his own hands (or feet, in this case):

After haggling over the Craigslist price, Lesh says, he asked for a test ride. The vendor agreed, and Lesh pedaled around the block back to the waiting cab. He tossed the Cannondale in the trunk and rode off. The vendor called about half an hour later, demanding Lesh return the bike and threatening to notify the police himself, though it appears that call never materialized.

The DCist has the story: Link | Video Clip over at NBC4 Washington