Are you Normal?

During a visit to the mental asylum, a visitor asked the Director what the criterion was which defined whether or not a patient should be institutionalized. "Well" said the director,"we fill a bathtub, then offer a teaspoon,a teacup, and a bucket to the patient and ask him or her to empty the bathtub" "Oh,i understand" said the visitor, "A normal person would use the bucket because it's bigger than the spoon or teacup."No" said the director,"A normal person would pull the plug."