In February 2013, Sarah Darling of Kansas City accidentally dumped her diamond engagement ring into the donation cup of Billy Ray Harris, a homeless man who often slept under a bridge. She didn’t realize it until the next day. When she found him and asked, he said yes, he had it, and he had kept it for her. He could have sold it, but he didn’t. Darling and her husband set up a fundraiser to thank him, and donations poured in from around the world.