Oh So Good Pineapple Cake

Description
This recipe came from an estate sale. I obtained it when I purchased the family collection from the Butler Estate in Irving, Texas in 1988.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * 1 box white cake mix
 * 1 can crushed pineapple undrained
 * ½ container ready to use vanilla frosting

Directions

 * 1) Prepare cake according to package directions.
 * 2) Pour in to a greased and floured rectangular baking pan and bake according to package directions.
 * 3) When cake is done poke holes in cake with large fork.
 * 4) Pour pineapple over cake.
 * 5) Place frosting in a small cup and microwave until softened.
 * 6) Pour over cake.
 * 7) Let cool before cutting.