An old man went to the doctor for his annual physical examination.
The doctor, seeing that the man looked a little worried, asked whether anything was troubling him.
“Well, to tell the truth”, the old man said, “Yes there is something that’s been troubling me. You see, I seem to be getting forgetful. 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 Doctor. What can I do?”
The doctor mused for a moment, then answered in his kindest tone, “Pay me in advance”.
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