Joe Cunningham was on a sidewalk in Minneapolis when he witnessed a mugger trying to take a woman's purse. He managed to take a couple of photos with his cell phone and called the cops.

It happened very fast in front of me as I was out walking. He shoved her to the ground and they wrestled for her purse. She clung tight and I shouted I was calling the cops. He heard me and gave her bag two more hard yanks and then fled empty-handed into the street. I helped her up and over to the payphone. Once the call was made I sat with her while she waited for the police. Her name is Patricia Yellow Hammer. She was shook up but uninjured save for a scuffed thumb. To pass the time and take her mind off her troubles we had fun making some pictures of random people, and by the time the cops arrived she had her smile back.

Link (Thanks, Russell!)