This happened to me the other day. P-plater in a VS Commodore tried to race me. I was in the left hand lane at an intersection, he was in the right. He was revving the engine, and I played along. But then when the lights turned green, I turned left into the side street...
Because I noticed the unmarked police Falcon at the opposite side of the intersection. Meanwhile, he's accelerating off in a cloud of tyre smoke, and the sirens start up. I turned around drove past where he had been pulled over laughing my arse off.