A little while ago I discovered that little man likes to imitate noises he hears.  I noticed it one day when he heard a little girl crying and began matching her pitch.  I noticed it again when I kissed him and he smacked his lips to try and recreate the sound.  Finally I was reading a story with animal noises in it and he was working hard to imitate the noises.  Since then, we have been practicing different noises. Sometimes he just looks at me like I'm crazy, but I love the moments when he grins and follows my lead.