O. Henry's trademark is his witty, plot-twisting endings, and his warm characterization of the awkward and difficult situations and the creative ways people find to resolve them. His most famous short story, The Gift of the Magi, epitomizes his style. It's a story about a young married couple, short on money, that wishes to buy each other Christmas gifts. That problem -- their lack of funds -- finds a famously endearing and ironic resolution.