Joke: The Bathtub Test

During a visit to the mental asylum, I asked the director how do you determine whether or not a patient should be institutionalised.
"Well," said the director, "we fill up a bathtub, then we offer a teaspoon, a teacup and a bucket to the patient and ask him or her to empty the bathtub.."
"Oh, I understand," I said. "A normal person would use the bucket because it's bigger than the spoon or the teacup."
"No.." said the director, "A normal person would pull the plug.