Runner up is Jedipenguin16
Soon after eating all the candy in the pinata, the penguin team discovered why Kowalksi had described candy as "forbidden."

And the winner is: Evviefoxx
One can only imagine what Private was doing below that shot that gave Kowalski such a look of complete and utter euphoria.
Believe it or not, this is the dirtiest caption... think about it.

Honorable mentions.

SJF_Penguin2:
KOWALSKI: "Albert Einstein! I thought you were dead! Oh, Al, I have a million questions for you!"

This... was a hard one... I wil try to make the next one easier.