Marvel
For "Avengers: Age of Ultron," these credits took place as a camera swept over a grand ivory sculpture of the Avengers battling a horde of Ultron robots. It was unusual and rather stately for a Marvel movie, and no one would blame you for thinking that sculpture was a CG creation, like most credits animations.
Turns out it's not! The folks at io9 spotted a Marvel exhibit showing off the actual sculpture used for filming the credits sequence in "Avengers: Age of Ultron," and took a video of it. Watch below!