Has anyone ever noticed that Optimus Prime is shown transforming from robot to vehicle mode only once in the entirety of the three films released so far? That one time occurs at the beginning of Revenge of the Fallen when he's dropped from the cargo plane. Why do you think this is? Do you think it's because it's harder to show him transform from a robot into a vehicle as opposed to the opposite? Or do you think it's due to the scripts for the past three films not including such transformation sequences? Also, do you think we'll see him go from robot to vehicle mode at least one more time in Age of Extinction?