Coconut Cake
["1 Duncan Hines butter cake", "1 (16 oz.) sour cream", "1 c. sugar", "1 pkg. flake coconut", "1 (12 oz.) Cool Whip"]
["Mix cake and bake in 2 (9-inch) pans.", "Cool.", "Pull thread through each layer (4 pieces).", "Mix remaining ingredients in a large bowl.", "Put lots of mixture between layers and the remainder on top and sides.", "Refrigerate for 2 or 3 days before serving (if you can wait)."]
["butter", "sour cream", "sugar", "flake coconut"]