Preheat oven to 350°F.

Prepare the cake batter: to a large mixing bowl combine the cake mix, the eggs, water and oil (all ingredient and measurements called for on the box) plus add in half of the dry chocolate pudding mix and sour cream.

Mix together using an electric mixer.

Pour batter into a greased 9x13 baking dish.

Bake according to the package directions- 22-28 minutes until a toothpick inserted in the center comes out clean.

Let the cake cool 20 minutes.

Using the end of a spoon, poke about 50 holes in the cake, about 1 inch apart.

Heat the hot fudge in the microwave (lid off) in 30 second intervals until pourable.

Pour the hot fudge all over the cake, getting some in each whole and smoothing the rest over the top. Let the cake cool completely.

Meanwhile, prepare the whipped topping.

In a mixing glass combine the heavy whipping cream, powdered sugar and remaining instant pudding mix. Using an electric mixer whisk until soft peaks form.

Smooth the whipped cream all over the top of the cake.

Add the Oreo cookies to a food processor and pulse until the cookies are crumbled. Evenly spread the cookie crumbs over the top of the cake.

Decorate with your favorite spooky graveyard decorations.

Cut, serve and enjoy! Refrigerate leftovers.