Slice the ends of the watermelon to create a base. Then slice the sides of the watermelon to make it look like a layered round cake. Dry the watermelon with a paper towel.

Frost the watermelon with thawed whipped topping on the sides and top to make it look like a round layered cake.

Decorate with strawberries and blueberries. Shave the chocolate bar for top of the watermelon cake.

Surprise your friends when you slide the "cake open.