You sort of attack somebody and they're laughing but if it's--but if somebody's trying to mug you you're not "Ah, this is so funny."

你假装打对方，对方会觉得很好笑,但如果有人抢劫你时,你不会觉得好笑“

耶鲁公开课 - 心理学导论课程节选

You have to realize that this is a mock attack; you're simulating attack.

必须打打闹闹时才行;,你是假装要打对方，不是真打。

耶鲁公开课 - 心理学导论课程节选