A favorite film of mine. I was very happy when a decent quality bluray became available a few years back. I know someone who uses "Warn. There is another system." as an alternative to "Hello, world".

I've wondered if D.F.Jones knew of the British Colossus code breaking system and named his computer that to tweak the security people. They couldn't really object, since Colossus was still a secret. Jones was in the British military and it's not impossible that he knew of the project.