Final question for anybody interested in laughter is, "Why can't we tickle ourselves?"

对笑感兴趣的同学，最后一个问题，“为什么我们不能胳肢自己？”

耶鲁公开课 - 心理学导论课程节选

Final topic is laughter and this is a true mystery.

最后要讲的是笑,这是一个真正的未解之谜。

耶鲁公开课 - 心理学导论课程节选