An American couple are driving across Australia when they come upon a man with his ear to the road. They stop and get out of their car to see why he's listening to the road.
They approach the man and see that he is of Aboriginal descent. He's wearing traditional clothes and carries with him a spear. Before they can even say a word, he shushes them.
'Down the road there is a truck' he begins. 'There are two people in the front and 7 people sitting in the back, 6 are male and 3 are female' He pauses straining to hear. 'The driver is wearing a red flannel shirt and has his left ear pierced twice.'
The two Americans are amazed. 'You can tell all that from the sound of the road!' cries the astonished husband.
'Nah' replies the tracker standing up,