The intuitive explanation I've found useful is: two-thirds of the time, he's telling you exactly where the car is. One-third of the time he can't help you eithe

The intuitive explanation I've found useful is: two-thirds of the time, he's telling you exactly where the car is. One-third of the time he can't help you either way. If you have a friend whose advice is more often right than wrong, you should generally take it.