In an insane asylum, three patients are up for release. The Doctor decides to give them an intelligence test. He turns to the first man and asks, "What is three times three?"
"274," he replies.
The Doctor asks the second man, "What is three times three?"
"Tuesday," replies the second man.
The Doctor turns to the third man, "Okay, your turn. What's three times three?"
"Nine," says the third man proudly.
"That's great!" says the doctor. "How did you arrive at that?"
"Simple," says the third man. "I subtracted 274 from Tuesday."