I took me a while to figure this one out. Charlie would go over to Marc's office, reach towards the desk and say, "Baby! Baby Peese!" At first I thought he wanted to watch Classical Baby on TV, but I figured out he wanted to watch videos of himself on Marc's iPad. He will giggle and laugh at the "baby" and knows exactly how to make the video play or move on to the next one.
We've also branched out and watched some YouTube, with cute doggies or other babies, which is what Charlie is doing here.
These kids and their technology!