1 box yellow cake mix
1 box vanilla instant pudding mix
4 eggs
2/3 c. oil
3/4 c. water
1 c. chocolate syrup

Mix cake mix, pudding mix, eggs, oil and water. Beat three minutes with electric mixer. To 1/3 of the batter add the chocolate syrup. Place 1/2 of remaining batter in a greased tube pan. Pour chocolate batter into pan and top with remaining vanilla batter. Cut through with a knife to create a marble-like effect. Bake at 350 degrees for 45 minutes.