1 box Duncan Hines butter flavored cake mix
1 c. sugar
1 (8 oz.) carton commercial sour cream
1 (12 oz.) pkg. frozen coconut, thawed
1 (9 oz.) frozen whipped topping, thawed

Prepare cake mix according to package directions, making two 8 inch layers. When completely cool, split both layers.

Mix sour cream, whipped topping, coconut and sugar. Put on cake. Seal cake in an airtight container and refrigerate for 3 days before serving, if you can wait that long.