UTTER MISERY
We don't know why. It is horrible to be unable to help Henry when he gets in these moods. In desperation Peter ran for his violin, and played him a solo through the door. It did seem to reduce the violence of the episode: Henry sat there on the front porch shaking with sobs and keening instead of hurling himself around and screaming. Several things were broken during the height of the frustrated rage, but thankfully no bones!