I got up from my desk to go fetch another Mello Yello Zero from the fridge and, as I got to the hallway, started composing a post in my head, leaving the ol' feet on autopilot to accomplish the beverage-fetching task.
When I returned my attention to what I was doing, I was not in the kitchen with the refrigerator open, but in a completely different room with my sock drawer open, feeling vaguely puzzled. As one might expect, there wasn't any soda pop in there. (And if there had been, it would have been warm anyway...)
What's the level of alertness that makes Condition White look vigilant?