So ... a comet's ... magic dust? Light rays?
Cause every machine (well, not EVERY machine, but MOST machines) to suddenly become sentient, bloodthirsty, have a hive-mind, and be able to negotiate terrain as though they have vision or sonar (planes get a pass on this one). I love the gore and soundtrack in this movie, but every time I watch it (thanks, Netflix!!), I waste most of it trying to figure out how simple Walkman headphones manage to manipulate themselves in such a manner as to strangle their user, independently of any human intervention. Or why cars and semi-trucks are so very DIFFERENT. Or how the hell a dog managed to die by forcibly eating a toy (that is incapable of movement unless it's on the ground). I guess it's a personal problem, lol. Kind of wish they'd remake this one. I think someone like Paul W.S. Anderson could actually make it look good!
They're coming to get you, Barbara!