You might think that I just won the lottery, or that Lucas said Mommy or something.  No, but after a good 6 months of signing milk to him, he signed it back to me today, and I am seriously on top of the world.  I thought I was just imagining things, but he did it a few times.  I even got it on video, so I hope you enjoy.  Watch his right hand very carefully!  This is a big milestone, because it indicates that we have bridged the communication gap with him, and he knows that language exists.  What a joyous moment.