Re: Audio sounds
In my industrial placement year out from uni (1990 - god I feel old...), I worked in an R&D group at a manufacturer of broadcast equipment. Desktops were Sun workstations or our own-brand Unix machines.
My manager (Dave) foolishly left his machine logged in when he went for a meeting. On his return I just heard him yell my name from his office - can't think how he figured out it was me. No matter what command he entered to his command prompt, the dulcet tones of Douglas Rain would softly say "I'm sorry Dave, I'm afraid I can't do that..."