Cake:

1 yellow cake mix
1 1/4 c. water
1/3 c. oil
3 eggs
1 can mandarin oranges (use juice to make the 1 1/4 c. water above)

Mix and bake at 350°F for 35 minutes.

Topping:

12. oz. Cool Whip
16 oz. can crushed pineapple, drained
1 pkg. Vanilla pudding mix

Fold ingredients together and use to frost cooled cake. Keep chilled.