Three sisters aged 92, 94, and 96 live in a house together. One night the 96-year-old draws a bath. She puts her foot in and pauses. Then, she yells down the stairs "was I getting in or out of the bath?"

The 94-year-old yells back "I don't know. I'll come up and see." She starts up the stairs and pauses. "Was I going up the stairs or down?"

The 92-year-old is sitting at the kitchen table having tea listening to her sisters. She shakes her head and says "I sure hope I never get that forgetful". She knocks on wood for good measure. She then yells "I'll come up and help both of you as soon as I see who's at the door".