Where do grandmothers go when no one is watching? Where do grandfathers go from time to time when they shouldn't? Why do they disappear now and then, and you unjustly shout "Grandma, Grandma, Grandpa, Grandpa"? Why do they pretend to go to the hairdresser, the café, the greengrocer, or the dry cleaner, while in reality, they are heading somewhere else? What...