1 (18.25 oz) package chocolate cake mix
1 can prepared coconut frosting
3/4 cups vegetable oil
4 large eggs
1 cup semi-sweet chocolate chips
3/4 cup butter or margarine, softened
2/3 cups granulated sugar
3 large eggs
1 teaspoon vanilla extract
2 cups all purpose flour
2/3 cups cocoa
1/4 teaspoon baking soda
1 teaspoon salt
1/4 teaspoon baking powder
1/3 cups water
1 to 2 (6 oz each) vanilla frosting

Don't forget garnishes, such as:

fish shaped crackers
fish shaped candies
fish shaped dirt
fish shaped solid waste
fish shaped ethyl benzene
pull and peel licorice
fish shaped volatile organic compounds
sediment shaped sediment
a 20-foot thick impermeable clay layer