A drag race on a suburban street at school break-up time, where vehicles reached speeds of 120-150 km/h in a 70 km/h zone, satisfies the 'probable consequence' test under s 8 of the Criminal Code (WA) — the killing of another person 'could well happen' in the prosecution of such an unlawful purpose. An implicit challenge to race, in the context of prior discussions about racing, is sufficient to establish a common intention to prosecute an unlawful purpose under s 8.
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