A very old joke from the days of ancient Rome:

During one of the civil wars a centurion burst into a villa and found there two young women and their chaperone. "Aha!" he cried. "Prepare to be ravished, women!" "Mercy!" cried one of the young women. "Do as you will with us, but respect the grey hairs of our beloved aunt!" "Silence, foolish girl," commanded the old woman. "War is war."