What kind of birthday cake do you get for the ultimate 'Transformers' fan? An Optimus Prime cake!  

A six-year-old boy has an Optimus Prime cake for his birthday, but it's not an ordinary cake. At the push of a button the cake talks, then transforms from a truck to a robot. 

YouTube user Russell Munro's son wanted a Transformer cake so he and his wife took it to the next level to create a cake that transforms.