My mom's friend sent us one, years ago, in which she talked about herself. She was taking Tai Chi. She had tried some interesting recipes lately. She was planning a trip by herself out West. She had seen some interesting things lately at flea markets. She wrote a whole paragraph about her victory in a "guess the weight of the cheese wheel" contest, and how she now had more cheese than she knew what to do with. This covered nearly a page, the last 2 or 3 lines of which mentioned that her husband had retired, and her two sons had numerous academic and personal achievements that year.
It was, of course, toungue-in-cheek, because we all knew about the many achievements of her family, and she was just poking fun at the ol' brag letter.