It was cake time again for my son's 6th birthday party. We had 22 kids and 20 adults at the house so I knew I had to make a big cake. Ben asked for an Optimus Prime cake and 7 hours later this is what I ended up with. I ran out of time and had to rush towards the end so it's not quite what I had envisioned. The brown cake is chocolate, the white cake is red velvet and the semi is white cake. The trailer is made entirely out of graham crackers 'glued' together with frosting and covered in fondant. It was surprisingly solid.