Has the phrase “Does not compute” ever been a real response from a legit computer system - or is it just Hollywood/Dr Who hooey? I can only recall hearing it from some hyper-intelligent machine, advanced enough to communicate in natural language yet too stupid to give a clue as to source of the error. A bit reminiscent of IBM’s old catch-all “Probable user error. Correct and re-submit”
I suspect that the phrase “Does not compute” hailed originally from the Robot on the TV show Lost in Space.
From here:
Yeah, "Does not compute’ would only work as an “out of order” sign.
Data never computes. Computers compute - if you’re lucky
Real error messages. – Truth is stranger than fiction. 
A perennial favorite is “values of β will give rise to dom!”. It’s explained here by dmr, the man himself.*
(*For non-Unix-geeks, dmr is Dennis M. Ritchie, the man most associated with developing the earliest Unix (and proto-Unix) systems and creating the Unix `look-and-feel’.)
The first time I ever heard the phrase used was by Jule Newmar in the TV show “My Living Doll”. (This pre-dated “Lost In Space”). Ms Newmar portayed a robot (a shapely, attractive one - to say the least) and when she was perplexed, that is what she would say.
Yes, My Living Doll ran from 1964-1965, while Lost in Space was from 1965-1968. Thanks for the correction, wolf_meister.