At one company I was the only person who knew how Quattro Pro worked and so the person put in charge of a spreadsheet that was not even close to being in my department that no one else could use and no one knew how to update.
After about three months of doing it I asked why was this not switched over to Excel and updated with new product and the old product purged. They did not know that was even possible.
So I got authorization for some Saturday overtime and in two weekends had their new, updated spreadsheet running in Excel. I included a first page that told you, in detail, how to up date the sheet.
Somewhere there is some poor sap trying to use that thing and cursing my name no doubt.
In 1986 McDonald's had a promotion for the Olympics. A USA gold medal gave a free Big Mac, a silver free fries, and a bronze free soda. I tracked my coupons on a Peachtree spreadsheet and had almost every event covered. When the Russians pulled out, there were so many winners. We couldn't eat all the free food, and didn't think of freezing it. I haven't had a Big Mac since then.