Once a Doctor had to examine 3 patients and certify their mental efficacy.
The Doctor called in patient 1.
Doctor:what is three times three?
patient1:one hundred.
Doctor decided the patient was mentally unfit and sent him back to the hospital.
Then he called in patient 2.
Doctor:what is three times three?
patient:thursday.
Doctor felt that he was also ill and he sent him back to the hospital.
now its patient3.
Doctor:what is three times three?
patient3:nine.
Doctor decided that he is all ok and let him off.
while going doctor asked him that how did he knew that answer.
patient3: replied'one hundred minus thursday is nine'.
Doctor:???????

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