It happened in Fresno, California, recently. A 47-year-old woman was walking cross a bridge when she saw a middle school volleyball team (shown below) jogging toward her. They saw her wave to them, so they waved back, but as soon as they passed, she tried to jump off the bridge. They ran to get their coach and he called 911. He told them to run back to the bridge and try to distract her.
By then, said one student, she was really dangling from the bridge, only holding on with one hand. So they started chanting, "Stop, your life is worth it" and talked to her for the next ten minutes. She eventually managed to pull herself back up, and then police showed up. The coach says she must have heard the kids yelling, and couldn't bring herself to commit suicide while they were all watching. He thinks that's the only reason she didn't jump.