Mental Hospital

In a " Mental Hospital " a journalist asked the Doctor:
How do u determine whether to admit a patient or not ?

Dr: Well, We'd fill a BathTub & give a teaspoon, a glass & a bucket to the patient & ask them to empty the BathTub..

Journalist: Oh, Obviously a normal person would use d bucket because its bigger..

Dr: " No, A normal person would pull d drain plug !!

Please go to bed No.39; We will start further investigations"..