Gerocognition

The Tangerine Turd seems have a bee in his bonnet about proving his (entirely imaginary) mental capacity, which rather reminds me of this:

During a visit to the local psychiatric hospital, Donald asked the Director how they determined whether or not a patient should be institutionalised.

"It's simple actually," said the Director. "We fill up a bathtub, then we offer a teaspoon, a teacup and a bucket to the patient. We ask him or her to empty the bathtub."

"I understand." said Donald "Obviously a normal person would choose the bucket because it's bigger than the spoon or the teacup."

"No. A normal person would pull the plug and let it drain. Do you want a bed near the window?"

Here's Little Feat with 'Fat Man in the Bathtub':