Peace of mind (but nothing else)

INSUBCONTINENT EXCLUSIVE:
It 20 years ago or so and this pilot fish is at a client site fixing something, when the office manager asks if he could double-check the
office backup as long as he there
Sure, says fish
Office manager then puts a tape in the tape drive of his PC and double-clicks an icon, after which a black window flashes on screen, but
just for a fraction of a second.&That's it!& says the office manager
&Fast, huh?& This doesn&t pass fish smell test — how much data could possibly be backed up in less than a second? So he tells the OM, Let
me take another look
He peers closely as that screen flashes up briefly once again.And he sees that it says: &Bad command or filename.&