3 x 3
Three elderly men are at the doctor’s office for a memory test. The doctor asks the first man, “What is three times three?”
“Two hundred and eighteen,” comes the reply.
The doctor rolls his eyes, looks up at the ceiling, and says to the second man, “It’s your turn. What is three times three?”
“Friday,” replies the second man.
The doctor shakes his head sadly, then asks the third man, “Okay, your turn. What is three times three?”
“Nine,” says the third man.
“That’s great!” says the doctor. “How did you get that answer?”
“Simple,” he says, “just subtract 218 from Friday.”