Here's "The Gift of the Magi" summary to refresh your memory.
Della has $1.87 and it's near Christmas. I'm not sure how much Jim has, but it's not much. Jim and Della love each other. They want to buy each other really nice gifts, but as you know, it's hard to buy really nice gifts for a $1.87 or less. Jim has this really nice watch that Della thinks would look really good on a brand new chain. Della has really nice hair that Jim thinks would look great adorned with brand new combs.
They're broke.
Jim sells his watch to buy Della the combs. Della sells her hair to buy Jim's watch chain. And you thought you were surprised when Santa brought you a bike?