I got this in a recipe exchange, and it sounded so good I wanted to share!
Hawaiian Orange Cake
1 Yellow Box Cake (Duncan Hines is best, but any will do)
3/4 Cup Vegetable Oil
1 15-Ounce Can Mandarin
With electric beaters, mix together the above. Pour into a greased 9x13 baking dish. Bake 30-minutes at 350-degrees (no more than that!)
18-Ounce Tub of Cool Whip
1 3.5 Ounce Box of Vanilla Instant Pudding
1 20-Ounce Can of Crushed Pineapple (do not drain)
Beat together and spread icing on cake. Cover cake and refrigerate at least four hours before serving. Place leftover cake in the fridge, covered.