If you are thinking of giving someone unforgettable gift cakes, then probably you would want to check out the lists of world's most creepy cakes. For the food fans, and those who love a little tweak on it, these cakes would certainly put an extra outlaid before even eating them.
Skull Cake * My favorite*
Cut hand cakes with rats
Groom gets killed cakes: A divorce cake
Dead Crow Cake