"Well, to tell the truth, Doc, yes," answered the patient.
"You see, I seem to be getting forgetful. No, it's actually worse than that. I'm never sure I can remember where I put the car, or whether I answered a letter, or where I'm going, or what it is I'm going to do once I get there -- if I get there. So, I really need your help. What can I do?"
The doctor mused for a moment, then answered in his kindest tones, "Pay me in advance."
