Check out Disney's real wall-climbing robot!

Disney Research Zurich and ETH Zurich (Swiss Federal Institute of Technology) developed VertiGo, a mobile robot that can roll up walls. It uses two tiltable propellers that keep it rolling and also provide the thrust that keeps it against the wall when moving vertically.

About why Disney is interested in this area, I am not able to say specifics as you can understand," Disney Research scientist Paul Beardsley told IEEE Spectrum. "But just speaking in general, one can imagine that robots with lighting effects could be useful for entertainment effects or for wall games. This also relates to the question of why the ground-wall transition is useful. If you have to manually place a robot on a wall at the start of a deployment, and manually remove it at the end, then that's taking manpower and it's not flexible. If the robot can make those transitions automatically, then you are a step in the direction of autonomous deployment, and that makes the technology more powerful. We are motivated by making a practical device, so it is real-world feedback and challenges that drive our work.