You do something stupid, that's--you're a stupid person.

你做了一些蠢事，那是因为你是一个蠢人。

耶鲁公开课 - 心理学导论课程节选

And I imagine the first person who articulated the question aloud probably met with the response saying, "What a stupid question. Of course things fall down."

我想象第一个人,大声提出这个问题,可能得到这样的回答，多么愚蠢的问题，物体当然下降“

耶鲁公开课 - 心理学导论课程节选