What was he on?
 "'Seest thou not yon cavalier who cometh toward us on a dapple-gray steed, and weareth a golden helmet?' 'What I see,' answered Sancho, 'is nothing but a man on a gray ass like my own, who carries something shiny on his head.' 'Just so,' answered Don Quixote: 'and that resplendent object is the helmet of Mambrino.'" 
 