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."