I knew the answer to final Jeopardy!
I was watching Jeopardy! with a friend, and the final Jeopardy! category was British Government. I started yammering some trivia about the British Government, and said the PM is the first lord of the treasury and the Chancellor of the Exchequer is the second lord of the treasury. Then I mentioned that the exchequer originally was a checkered tablecloth. The Chancellor of the Exchequer would lay his checkered tablecloth on a table, then put counters and coins in different boxes, and that was the first spreadsheet.

When the actual Final Jeopardy! answer came around, it was something like: "This position refers to a tablecloth with boxes which was used like an abacus."
(Barticus, Tue 28 Jan 2014, 5:32, Reply)