Copycat Tennessee Ernie Ford's Pea Picking Cake

box (18.25 ounce size) yellow or white cake mix

butter or margarine

eggs

small can mandarin oranges, save juice for cake mix

Frosting

container (12 or 13 ounce size) Cool Whip, thawed

small or medium can crushed pineapple, save juice to pour over cooled cake

package (3 ounce size) instant vanilla or coconut pudding mix