1 yellow cake mix
1 lg. can crushed pineapple
1 lg. pkg. vanilla pudding (not instant)
Cool Whip

Make cake in 13"x9" pan. Drain pineapple, bring to a boil and turn off heat. When cake has 10 minutes to cook, prepare pudding. Remove cake from oven, poke all over with large fork or straw. Pour hot pineapple over hot cake. Spread hot pudding over pineapple. Cool. Frost with Cool Whip.