Prepare pudding using directions on the box. Allow to set.
Add whipped topping to pudding, folding gently.
In a 9x13-inch baking dish, layer starting with graham crackers, then pudding mixture, more crackers, more pudding, then top with another layer of crackers. (You’ll have to break crackers up to make them fit edges and corners.) You should have 3 layers of crackers and 2 of pudding mixture.
Remove the lid and foil from the icing. Melt in microwave using 30 second intervals, until pourable. Then pour over the top layer of graham crackers. Smooth if necessary. Cover and chill at least 3 to 4 hours, but preferably overnight for best results.
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