Reminds me of O. Henry's short story, The Gift of the Magi.
I must say, I hated the film, Castaway. H rather liked it and watched it several times when it came out on television, but I found the movie frustrating and inauthentic. It's the inverse of Robinson Crusoe, in which the protagonist draws closer to God during his time marooned. Faith is noticeably absent from Castaway and I find it difficult to believe that Tom Hanks' character would survive a plane crash and years alone on an island and not become a deeply faithful man - even if he began his journey as an atheist. In my worldview, I can't imagine how a human being could spend years talking to a volleyball and not God.
It is the same in my mind as is shown in the video above: the castaway had salvation with him all along.
How's that for tragic irony?