1 box yellow cake, baked according to pkg.
1 lg. pkg. strawberry-banana Jello

Bake cake according to package directions and let cool. Mix Jello according to package directions but do not set. Leaving cake in pan, poke holes into cake and pour Jello over entire surface of cake. Cake will absorb Jello like a sponge. Refrigerate for 1 hour and serve with Cool Whip.