Oh Captain, My Captain

Title:  Oh Captain, My Captain
Pairing/Warning/Rating: none, rated G
Word Count: 100
Summary:  The Doctor ponders Jack as they part at the end of "LOTTL"
Author's Note: written for the Userpic Drabble Challenge, snitched from unfeathered

( Take a look at your default userpic. If you're like me you see it so often you've almost stopped seeing it at all, so take a good look at it. Now, using your avatar as inspiration, write a drabble. )