Who's there?

Three sisters, ages 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. 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 and 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."