Transformers
It’s amazing how much can be done digitally nowadays. CGI has raised the quality of films dramatically since it was made. Think about it, if there was no CGI, the Transformers either wouldn’t have been possible, or they would have been done so poorly, they would have never become as popular as they are today.
300
You didn’t actually think they fell off a real cliff, did you? As is the case with many other action movies, or just movies with action scenes in them, the actors did the stunts in front of a green screen along with special mattresses to break their fall. It must be so much fun to jump off that ledge and land on a giant soft mattress!