Preheat oven to 325 degrees. Grease and flour a 9 x 13 pan.
1 box white (trash) cake mix
1 3.8 oz. box pistachio Instant Pudding (you'll use 1 more for the icing)
1 c. oil
1 c. lemon-lime soda
Mix it all up and slap it into prepared 9 X 13 pan. Bake at 325 for 30 minutes. Test with toothpick for doneness, and don't panic if it sinks some in the middle. The Watergate chefs never panic. They're cool as English cucumbers. Besides, mine always sinks in the middle and the cake is fine.
Mix together while the cake is baking.
1 8-oz. tub Cool Whip (Extremely white trash. Deliciously so. The Watergate doesn't even know what it is, I'm sure!)
1 3.8 oz. pistachio Instant Pudding
1 c. whole milk
Mix and put in fridge (that's "re-frig-er-a-tor" at the Watergate)
When icing is cold and cake is cool, turn the cake onto a platter and ice that baby up! This cake is amazing. You know how it's hard to stop eating a bag of pistachios? It's just as hard to stop eating this cake!