My great-grandfather (97!), my only living great-grandparent now, is in an Iowa nursing home. Recently he played a little joke on the nurses. It was mid- to late-afternoon; one of the nurses came out of his room and told 2 other nurses she thought he had quit breathing. So 3 nurses went in there, and one leaned over and said, "Martin!" He opened his eyes and said, "BOO!" Needless to say, it must have given the nurses quite a reaction.