I am from Austria
We were asked if it was possible to let a helicopter take off right in front of the Raimund Theatre in Vienna. Of course the answer was YES.
The Sequence is part of a Video playing on an 5x5m big LCD Panel right on Stage. We took reference Photos of the helicopter model and lit the 3D Scene with an HDR Pano from where it should take off. The result is a photorealistic Rendering and minor Compositing work, such as Cleaning up the Background, adding heated air and a little bit of Rotoscoping work.