1 box pudding, cooked (size and flavor goes according to leftover cake)
2-3 day old cake (the part your family won't eat any more)
Whipping topping (your favorite kind)

Take your old cake and cut or bread up into small pieces and place evenly into a cake pan. Cook pudding according to box and pour over cake, making sure you cover all pieces. Cool in refrigerator according to pudding direction and serve with whipped topping.