There are three old men seated inside a doctor’s cabin – all suffering from bad memory.
The doctor wants to take a little test – so he asks the first old man, “Can you tell me what is four times four?”
The first man replies, “756”.
The doctor can’t believe this. So he moves on to the second old man asks him, “Your turn. What is four times four?”
The second man replies, “Friday”.
The doctor shakes his head in disbelief and then asks the third man, “Do you think you have the answer?”
The third old man replies, “Sixteen”.
“Wonderful!” says the doctor. “How did you get that?”
“Easy,” the third old man replies, “Just add 756 to Friday.”