There's not much else I can say- he's become the exorcist. When this screaming first started, I thought it was so cute. Even in this particular video, it's cute to me (not annoying at all).
However, he has now learned that he can make the scream even more shrill and loud if he wants something he can't have- like the metal prongs coming out of the laptop charger. It's amazing how this discovery happened in less than 2 days. It literally went from sweet, innocent little squeaks... to evil, blood vessel popping, "my mom is trying to murder me" wails. But here's the cute version: