Behind the scenes of The Dark Knight...
All the clown make-up at circuses and clown masks in stores are copyrighted. So the production had to come up with their own clown designs!
Aaron Eckhart's make-up consisted of a partially shaved head, and some spotting on the scalp and ears. Everything else was CGI.
Amazingly, most of the cars, trucks, Batcycle, and police vehicles shown during the dramatic under-interstate chase were models.
Here are some other shots. You see how much of the look of the film was CGI.