1. Bake a Lemon Cake mix (Betty Crocker) according to package directions. Use a greased and floured 9x13 inch pan.
2. Ten minutes after removing from the oven, poke holes all over the cake with the handle of a wooden spoon.
3. Pour crushed pineapple with juice over the cake in the pan.
4. Fold 1 package lemon instant pudding into 1 1/2 cups milk.
5. Fold this into 1 small carton Cool Whip.
6. Spread over cake.
7. Top with coconut! (optional).