guy sitting by the window in roadside diner having lunch, he notices that as the vehicles drive by, all the trucks have bird feathers on the fronts,
But the none of the cars have any damage. When he finishes his lunch he is inquisitive about the happenings.
So he goes back up the road a little And there is a fair sized pile of road kill with a murder of crows doing clean up. Just up from there is one crow on lookout.
As a car approaches, it says, caw...caw
But when a truck approaches it says nothing...