Scott Thomas Miller, 32, pleaded guilty to a charge of common assault in the Blenheim District Court yesterday.
Mr Harris said the victim in the incident was a 14-year-old boy who was not known to the victim.
About 9pm on October 10 Miller was at a friend's house and went outside, where he noticed a person crouching beside his car.
He approached the boy and asked him what he was doing, to which the victim replied he was playing hide and seek. Miller didn't believe him and hit him in the ear.
In explanation to police he said he believed he was protecting his property.
His lawyer, Rob Harrison, said his client had thought someone was interfering with his car and gave him a "clip around the ears".
"When you and I were 14-years-old a clip around the ears was not unheard of and in fact we got hit at school with a piece of wood," Mr Harrison said to Judge Russell.
Judge Russell told Mr Harrison to "speak for himself" before ordering Miller to pay a $200 fine and court costs of $130.
"I'm starting to get the picture now that this young person shouldn't have been where he was, but likewise you can't go around hitting people," Judge Russell said
- The Marlborough Express