I was in San Francisco a few months back out side my hotel taking some photos at night of these cool key shaped post along the road. As I was shooting, these three kids came running by towards the hotel parking garage. I was like weird but what ever. About 30 secs later some lady and guy came running by. I was like this isn't good. Long story short, the lady was waiting on an Uber ride and these kids grabbed her phone out of her hand and ran! They caught one guy but the ones with the phone got away. So ya, you just never know whats going to happens. I'm just glad the OP wasn't injured.