Three sisters ages 72, 74, and 76 lived in a house together. One night the 76-year-old drew a bath. She put her foot in and paused. She yelled down the stairs "was I getting into or out of the bath?"

The 74-year-old yelled back "I don't know. I'll come up and see." She started up the stairs and paused. Then she yelled, "was I going up the stairs or down?"

The 72-year-old sat at the kitchen table having tea, listening to her sisters. She shook her head sadly and said, "I sure hope I never get that forgetful." She knocked on wood for good measure. She then yelled, "I'll come up and help both of you as soon as I see who's at the door."