“Many years ago, I watched a young boy rock back and forth as he worked a crossword puzzle. I tried to distract him from working the puzzle to ride bikes with me. I continuously asked him to play with me, but he kept staring at the puzzle while I attempted to look in his eyes. He took the puzzle apart and flipped the pieces in the air, one at a time. He did not speak, but he made crying noises. The more I asked questions or talked to him, the louder his cries became. As his frustration grew, he balled his fists up, punched his eyes, an ....