Dumbest part of the script? The part i PRAY they change....
Spoiler:
During the final battle, the part where the spark rolls into the car of two wanna-be white rappers, and parts of their car(?), because of the spark, turn into Transformers...wtf? That sounds absolutely ridiculous. That say's to me that
any mechanical object when given the spark can become Transformers. I know it's soppose to be somewhat of a comic-relief scene (maybe Vanilla Ice will make a cameo

) but it really takes away how complexity of what Cybertronian aliens are sopposed to be. Are they just hunks of metal brought to life by their spark? I'd like to believe they are more than that.