An angry motorist grabbed a boy by the scruff of his neck after he dropped a conker from a bridge on to his car.
The 12-year-old was playing with conkers on a bridge overlooking London Road, East Grinstead, on Saturday lunchtime.
The man drove round the one-way system and returned to the bridge, grabbed the boy by his neck and kicked him.
A police spokesman said a member of the public intervened and they are asking that person to call them on 0845 6070999.
The man was aged 25-30, slim and had short, dark hair. He drove a small silver car, possibly a Ford, and had a woman passenger.
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