The health minister is visiting a psychiatric ward. He asks the head of psychology, "How do you determine if a patient is cured."

The psychologist explains:

"We take them to the bathtub, which is filled with water, hand them a spoon and a cup and ask them to empty the bathtub."

"I see," says the health minister, "the cured person would choose the cup because it`s bigger, and would empty the tub faster."

"Actually no," replies the psychologist, "a normal person would simply pull the plug."