WTF?

Saul has a new favorite trick. He screeches as loud and high as he can. I have no idea why he's doing this; it makes my throat hurt just to listen to it. Not to mention my head. He does it whenever he's in a playful mood and sometimes he keeps it up for half an hour or more, only stopping to take a breath every now and then.

Does anyone know if this is normal? Cause if it is, then someone should have warned us.