You scream and scream and throttle and throttle and --
Oops! You've done snapped his head right off.
Quick -- put it back on before anyone notices... Wait -- there's something odd. His neck is the ball of a ball-joint. No wonder it was so easy to pop apart.
You pick up the head, place the socket on top of the ball-joint, and give it a good shove. Ping! Right back in place, no worse for wear.
And he starts screaming again.
Relieved for the moment, you sit back. What kind of kid has a ball-joint for a neck? He's not human -- must be some kind of android. And androids have no emotions as such, so perhaps his screaming was some kind of technical misalignment?
You decide to look for a control panel on the boy android, so you can switch his screaming off.