There was a Soldier deployed to Afghanistan. While he was there he received a letter from his girlfriend. In the letter she explained that she had slept with two guys while he had been gone and she wanted to break up AND she wants her picture back.

So the Soldier does what any squared-away Soldier would do. He went around to his buddies and collected all the unwanted photos of women he could find. He then mailed about 25 pictures to his girlfriend with the following note:

I don't remember which one you are, please remove your picture and send the rest back!

oldie but a goodie.