A substitute teacher was trying to make use of her psychology background. She began her class by saying, "Everyone who thinks you're stupid, please stand up." Right away, Little Johnny stood up. The teacher said, "Why do you think you're stupid, Little Johnny?" "I don’t, ma'am, but I hate to see you standing there all by yourself!"
代課教師試圖運用她的心理學知識。開始上課時，她說：“誰覺得自己很愚蠢，請站起來。”小約翰馬上站起來了。老師問：“為什麼你覺得你很愚蠢呢，小約翰?”“我不覺得我很蠢，只是我不願意你一個人站在那!”