The twist in O. Henry's short story "The Gift of the Magi" lies in the ironic juxtaposition of the characters' selfless sacrifices with the ultimate futility of their actions.
Della and Jim, a young couple struggling to make ends meet, each sell their most prized possessions – Della's beautiful hair and Jim's heirloom watch – to buy the other a Christmas gift. They both believe they have made the perfect sacrifice for their loved one. However, the gifts are ultimately rendered useless because Della's hair is no longer needed for the comb Jim bought her, and the watch is unnecessary because Della sold her hair to purchase a chain for Jim's watch.
This irony underscores the story's central theme of love and sacrifice. The characters' actions are motivated by their deep love for one another, but their lack of communication and their inability to see the bigger picture leads to a tragicomic outcome.
The twist highlights the human tendency to act impulsively and make decisions based on limited information. The story serves as a cautionary tale about the importance of communication and understanding in relationships.
The twist also creates a sense of bittersweet humor. While the characters' actions are ultimately futile, their love and sacrifice are still heartwarming and touching. The story leaves the reader with a sense of both sadness and hope, acknowledging the imperfections of human nature while celebrating the enduring power of love.