A few middle-aged couples are chatting at a dinner party when one husband, Harry, starts talking enthusiastically about a new restaurant he has just visited with his wife. What's its name, demands a friend. Harry looks blank. There is an awkward pause. "What are those good-smelling flowers with thorns called again?" he eventually asks. A rose, he is told. "Yes that's it," Harry announces before turning to his wife. "Rose, what's that restaurant we went to the other night?"