Heat oven to 350^. Make cake according to package directions bake in a 13 x 9-inch cake pan or 24 cupcake liners in muffin pans. Bake according to package directions. Poke holes every 1/2 inch apart with a wooden spoon handle in the cake or 3 or 4 holes in the cupcakes. Set aside. Beat pudding mix and milk with a whisk for 2 minutes. Pour evenly over cake or equally over cupcakes. Run a knife around edges of cake to loosen. Chill 2 hours. Store covered in refrigerator.