Since I had Tron on the brain, thanks to an awesome trailer, I ended up remembering another instance of primitive computer graphics: Horror movie I believe. Guy goes into an arcade after it's closed to play one of the games. It has a joystick and an attached gun. The console explodes, releasing a couple wire frame enemies and the game's announcer's voice. He realizes he's holding the now detached laser gun and finds it works for real. Given that the enemies also work for real, he decides to ditch the place and run. As punishment for that action, the game's Big Bad, in the form of a wire frame face, decides to show up and eat him.
So, any ideas?