A Springdale Heights father became so enraged by his son dropping fried chicken takeaway wrappers on the floor that he hurled a knife at the boy.
His aim was awry and the knife instead hit a wall.
But the knife then ricocheted into the boy's back, leaving him with a wound that police said was six centimetres long and two centimetres wide.
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A witness tried to stem the flow of blood, Albury Local Court has heard, while the boy - not his father - phoned for an ambulance.
The unemployed man, who cannot be named, was to have been sentenced this week, having previously pleaded guilty to a single domestic violence-related charge of reckless wounding.
He attended court and, magistrate Richard Funston was told, was keen to get his matter dealt with, but fell ill and had to leave.
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Mr Funston accepted the excuse, including a submission that the man, 44, was suffering stomach pains.
He further adjourned sentencing to May 19.
The court was told the man and his son lived in the same house.
They got into an argument on March 16 about 8pm "over the victim taking some rubbish to the bin".
They were both in the kitchen, while a witness to what unfolded was in the lounge room.
"During the argument the victim threw some KFC rubbish on the ground," police said.
"The victim then began walking into the lounge room.
"As the victim walked into the lounge room, the accused threw a kitchen knife towards the victim.
"The knife bounced off the wall and struck the victim in the back, causing a laceration to his back."
Police said the witness saw the victim walking into the lounge room and the knife bouncing on to the floor.
He picked up the knife and walked back in to the kitchen, where the father was sitting on a chair in front of the stove.
The witness, police said, saw the father holding another knife so immediately took this off him.
The man then walked back into the lounge room and began treating the victim's injury by strapping a rolled-up towel over the wound to try to stop the bleeding.
He sat the boy on a chair in the kitchen, then moved him outside. As this happened, the boy phoned for an ambulance.
Police arrived at the residence a short time later to find the victim being treated by paramedics.
The boy was taken by ambulance to Albury hospital, where he received nine sutures for his wound.