Carnac the Magnificant

Johnny Carson had a recurring skit where he would play Carnac the Magnificant. Carnac was a psychic. Carnac had a stack of sealed envelopes with questions inside. Like Jeopardy, Carnac would tell us the answer before we knew the question. Carnac would hold an envelope up to his forehead and answer the question that was contained in the sealed envelope. He would then open the envelope and read the question.

In one case, he held an envelope up to his head and said the answer was, "Cool Hand Luke". What was the question?

I'll post Carnac's question in a week if no one knows.