Leonardo said:
What's gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow, gray, yellow?
Better answer: Frink's favourite threads.