Detailed Instructions: Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
Problem:In the Transformers films the Autobots and Decepticons always change between their humanoid form and (with the exception of Bumblebee's upgrade) the same cars. Assuming that they choose vehicles because they want to blend in on earth, they must be able to transform into a myriad of other mechanical objects (most likely with some size restrictions). Why don't they transform from plane to car to ship and back again as required?
Solution:
Why do the Transformers always transform into the same cars?