It's especially wrong to hurt children.
Gary's son Larry tells him that he broke Gary's expensive guitar because he was kicking a ball indoors which he was told not to do.
Gary wants to punish Larry.
Gary tells Larry that he was told not to kick a ball around inside and will be grounded for a month for this.
Gary slaps Larry across the face and shoves him to the ground as he yells obscenities at him.
The idea that he should follow the instructions of the adults around him sinks in to Larry, and he vows to better his behavior.
Larry is traumatized and terrified as he endures the physical pain of the beating.