Old fashioned paper timesheets.
We filled the stupid things in every week, despite that fact that most of us were assigned to a particular project, and so only had one line on it.
My mate noticed a steadily growing pile of time sheets on the boss' secretaries' desk. He asked "what's happening to these then?" and was told that they were going to be analysed.
Week or so later, he noticed a large wad of paper in a bin. The timesheets for the previous few months.