Some manner of simulator (whether Hard Light Holograms, a Cyberspace Virtual Reality program, or even just robot mannequins) suffers a Phlebotinum Breakdown. Naturally, said breakdown targets the safety features of the simulator first (rather than, say, shutting the whole thing down) and everything Goes Horribly Wrong, turning the sim, originally intended for training or pleasure, deadly.
The [...] [tvtropes.org]