A man walking along the road saw an Indian lying with his ear to the
ground. He went over and listened. The Indian said, "Large wheels, Ford
pickup truck, green color, man driving with large police dog next to him,
Colorado license plate and traveling about 75 mph." 
The man was astounded. "You mean you can tell all that just by listening
with your ear to the ground?" he asked. 
"Ear to ground, nothing," said Indian. "That truck just ran over me."