What films take existing technology and repurpose it while maintaining technical correctness?
- War Games
- War dialling
- The old payphone voltage dropping trick on an old payphone
- Talking with old beards about system weaknesses
- Blown Away
- Bomb blast physics
- Enemy of the State
- Surveillance by RF cams = good
- Explosion destroys building = bad, explosions throw stuff; better to build an inferno that melts everything.
That's a really short list. Any other candidates?