An overweight blonde consulted her doctor for advice.
The doctor advised that she run 10 miles a day for 30 days.
This, he promised, would help her lose as much as twenty pounds.
The blonde follows the doctor's advice, and, after thirty days, she was pleased to find that she'd indeed lost 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?"