Some guy at Coachella in California stuffed 100 stolen phones in his backpack but forgot people can track those things. Duh.
Police arrested a New York man after several people couldn't find their phones and activated the "Find My Phone" feature, which pointed them to a guy walking around with a backpack. Some festival-goers have since been reunited with their phones, and those who haven't have been directed to Coachella's lost and found.
Source: Mashable