Louise suffers from muscular dystrophy. While trying to exit a train station one day, she found herself facing a large flight of stairs without an elevator or escalator. On the verge of tears, Louise saw a man suddenly appear, pick up her bag, and gently help her up the stairs. When she turned to thank him, he was gone.

Michael was late for a meeting. Already stressed from a relationship breakdown, he started battling London’s traffic only to get a flat tire. As he stood helplessly in the rain, a man stepped out of the crowd, opened the boot (trunk), jacked…