Imagine you and your boyfriend were lying in bed, holding each other, comfortably and delightfully. And all of a sudden, he called you by his previous girlfriend’s name. What would you do? Did he call the ex’s name because he still had feelings for her? Or did he, as he would defend for himself, just make a slip of tongue? And can we judge whom your boyfriend truly loved by that slip? To understand what he was really thinking about at that moment, we have to examine what slips of the tongue are and what they can tell us.