N
a person with learning difficulties who performs brilliantly at some specialized intellectual task, such as giving the day of the week for any calendar date past or present 白痴学者
What sustains it is the three-way chemistry of the ingratiating Everyguy Crystal, the pathetically vulnerable, almost fetal Stern, and the dissembling know-it-all Lovitz, who does a virtuoso job of teetering between being an idiot savant and an idiot.