Three old sisters... 92, 94, and 96 years old. All lived together. One day the oldest drew a bath. She put one foot into the water, paused, then called downstairs to her sisters, "am I getting in the tub or out of the tub?" The middle sister started up the stairs to help, then paused, and called back downstairs, "Was I going up or coming down?" The youngest sister, who sitting at the kitchen table having tea, said, "I guess I'll have to help. I hope I never get that forgetful!" and knocked on wood. She got up, then paused and called, "I'll come up as soon as I see who's at the door."