I love analyzing how computers in movies work.  In S1m0ne, director Viktor Taransky replaces a high-maintenance actress who’s walked off the set of his movie with a computer-generated actress.  The public thinks she’s a real person and demands to see more of her.  Taransky eventually responds by scheduling a huge stadium concert, where Simone appears in hologram form amid a stage full of smoke.

He creates this elaborate effect with a simple button on the computer console:

It’s lucky the computer comes with that button on it.  Otherwise he never would have pulled it off.

(It’s honestly a good movie with an interesting premise.  It just gets rather carried away with the technology.)