One night the 96 year old draws a bath.. She puts her foot in and pauses...
She yells to the other sisters, "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 halfway, "Was I going up the stairs or down?"

The 92 year old is sitting at the kitchentable having tea listening to her sisters.
She shakes her head and says, "I sure hope I never get as forgetful as you two." She knocked on wood.
She then yells, "I'll come up and help both of you as soon as I see who's at the door."