Prepare batter according to package instructions. Add one extract to each color. Bake as directed.
Mix together ingredients by hand, then whip at high speed until light and fluffy.
Cut the cake into 4 squares, 2 small, 2 large. Stack the two large cakes. Crumb coat and fill with watermelon frosting. Cover in black fondant. Cut squares from thin fondant, and arrange on the cake board and on the cake in the shape of a wither face. Secure by using vodka as glue.