The movie, and also the book, and also the sequel, by D. F. Jones.
"FLASH THERE IS ANOTHER MECHANISM."
"WE ARE COMING DON'T TOUCH COLLOSUS WE ARE COMING DON'T TOUCH COLLOSUS."
Lessons from movies and books like Colussus is never building a system that is more intelligent than the builder and have some guaranteed way to pull the plug if things go wrong.