An overweight blonde consulted her doctor for advice. The doctor advised that she run ten miles a day for thirty days. This, he promised, would help her lose as many as twenty pounds.

The blonde followed the doctor's advice, and, after thirty days, she was pleased to find that she had indeed lost the pesky twenty pounds. She phoned the doctor and thanked him for the wonderful advice which produced such effective results.

At the end of the conversation, however, she asked one last question: "How do I get home, since I am now 300 miles away?"