Step 2- Frost your sponges with any kind of frosting. Make sure you have enough to make the frosting thick. Mine was a little thin and you could see the two "layers" of the cake. More frosting would hide that.
Step 3- Decorate your cake. I used lost of sprinkles on top because we love sprinkles in our house. Make sure you have a cake knife to cut your cake and plates ready for each person. This makes your prank a little more believable.
Enjoy the fun of watching the pranked person try to cut the cake. It just doesn't work!
Last step.... Make a REAL cake to enjoy.