By the way, I practically cried during the movie when I saw that they killed Optimus Prime.

You know, this ruined the movie for me. I couldn't believe they killed him off so quickly. I don't know why they did that, but I've talked to others recently about this, in fact, who remember this as a traumatic event in their childhood. Even at the time I remember thinking the reason for this must be to try and get us to buy new toys (I never did buy the new toy, and I can't remember his name), but I don't know if that was it or not.