You are a South African bush pilot.
 
You fly in some critical medical supplies, enjoy a quick lunch at the hospital. It's a stifling 100 degrees in the shade and you're eager to get back up to the cool, high blue yonder. On the way back to your plane, you discover that the only bit of shade, within 10 miles, has become very popular . . .
 
You start calculating the distance to the plane door and wonder . .