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Make and bake the cake according to the directions on the box.
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After the cake has cooled, use a wooden spoon handle (or other similar size utensil), and poke holes all over the cake down to the bottom.
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Then mix the pudding powder with the milk, and pour over the cake, using a spoon to work it gently down into the holes.
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Chill in the fridge for at least a couple of hours. Then spread the whipped topping over the pudding layer and chill again if desired.
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Crush your vanilla wafers in a ziploc bag. Now some people spread the crumbles all over the cake.
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Serve banana slices on the side or place on top at the time of serving if desired.