Back in the early 70's a friend used to work nights along with 2 colleagues.
Their job was to electronically collect and collate the cigarette sales from all over the UK ready for a presentation to the directors the following morning.
At first it took all 3 all night but one of them wrote a secret program that did it in under an hour.
2 got their heads down whilst the third stayed awake to make sure it worked and finished.
It took 20 years before they got caught out and all 3 made redundant.