'Swinging the lamp' from my Army days, the Generals ADC (captain) wants to know why I'm calling to cancel as the general can't be expected to be driven 4 hours to his meeting. I gave him the odds...50% out of limits at take off time....30% getting a few miles along track and having to turn back...10% chance of getting there and 10% chance of killing all of us, ask the general if he's willing to die today rather than take the car?