I call in every army in world to hunt down VuvuZeldaMan. He is soon captured and the, ahem, cake is retreived.
Using the miracle of SCIENCE! I rewind time until the cake is in it's pregame condition. Next time-freeze the cake so that nothing can affect the cake. Then I shrink the cake until it is smaller than an atom and hide it within the structure of an element choosen at random by an omnipotent computer that has unique feature about the atom that only I know.
Now to hide the atom. First I cast a spell that hides the knowledge of the atom from anyone that is not myself or the computer. Second I instruct the omnipotent computer to send the atom to a time, location and dimention chosen at random except the exact location of the computer itself. Next I oblitorate all the atoms of the computer. Finally I scramble my neurons so that I have no recollection of the cake but the ability to recall the knowledge if I am exposed to a special psychological trigger.