Visiting the psych ward, a man asked how doctors decide to institutionalize a patient.
"Well," the director said, "we fill a bathtub, then offer a teaspoon, a teacup and a bucket to the patient, and ask him to empty the tub."
"I get it," the visitor said. "A normal person would use the bucket because it's the biggest."
"No," the director said. "A normal person would pull the plug."