Yum Yum Cake
["1 box yellow cake mix", "1 (20 oz.) can crushed pineapple in its own juice (not heavy syrup)", "1/3 c. sugar", "2 boxes vanilla pudding (cooking kind)", "Cool Whip"]
["Make cake as directed. Bake in a 9 x 13-inch pan. Mix together pineapple and sugar; bring to a boil.", "Pour over warm cake.", "Cook pudding according to package directions.", "While still warm, pour over pineapple mixture.", "Cool and top with Cool Whip. Must be kept in the refrigerator."]
["yellow cake mix", "pineapple", "sugar", "vanilla pudding"]