When our son Jimmy went to Navy boot camp, we waited impatiently for word from him.
Finally we received a post card telling us he was doing well and we shouldn't worry. It went on to say that he was being kept busy acclimating to a military lifestyle and that he would send a detailed letter in a couple of weeks.
After reading his card a second time, however, we noticed that Jimmy had faintly underlined letters throughout the note.
When the letters were combined, his hidden message read, "Help me!"