DEAR MISS MANNERS: I know it is rude to interrupt someone else's conversation. But is there a polite way of doing so when one is at a dinner party at a restaurant that includes one's mother? And overhears her beginning to launch into a story about you that you would really prefer remain unshared?
GENTLE READER: "I may have already told them this. Why don't you tell them about the time you fell into Cousin Mariah's wedding cake? That's a hilarious story."