Fight or Flight
The boy had spent the day with his parents at Disneyland, where he had consumed massive amounts of every kind of junk food available. When the family got home the boy's father found him raiding the refrigerator. "How can you be hungry?" his father asked. "You've had cheeseburgers and fries, nachos, popcorn, cotton candy, soda, ice cream, and now you're eating again." "Oh," said the boy, "I was just working up an appetite."