"Yes, really," your mother says, "why should it be so surprising?"
Think, man, think!
Your mind races, from the screaming boy, to your mother's ramblings, and back again. Quick -- she's waiting -- just throw something out there!
"Because of, uh, the situation with the kid?"
"Well, yes, there is that..."
She bought it! You don't know how, but she bought it! Your mother heads back into her aimless diatribe. You take the opportunity to gently put down the phone, and leave her talking away to herself about who-knows-what.
That done, what is it you were about to do?