When approached to do a commercial for Subaru's powerful WRX STI rally car, creative agency DDB Canada had an unusual idea: Do a flip-book animation--by adhering 760 individual and precisely-spaced frames to a one-kilometer-long wall on a test track. Then mount the camera to the car, which whips along the wall, and once the driver hits a certain speed, the frames blend. Check it out:
Needless to say this took tons of preparation, as you can see in the making-of vid below. Kudos to DDB C's team for insisting it could be done, and doing it, in the face of detractors claiming it would be impossible to pull off without a green-screen.