The Sally Effect began in 2008 in a New York City diner, where waitress Sally received a large tip with a request to treat herself. Instead, she helped a neighbor in need, sparking a wave of generosity. Coworkers and locals joined her mission, turning individual acts of kindness into a neighborhood movement. This initiative fostered a caring community, showing how one act can inspire widespread compassion and unity, emphasizing the potent impact of altruism on social dynamics.