Cost of meeting clock

My dad just told me this story about a company that he consulted for. The meeting room had a punch clock, where each employee would punch in when the meeting started. The punch clock was somehow connected with a database of salaries and a clock on the wall, which showed the amount of money spent so far in combined salary to the people in the room. Interesting idea.

Does anyone have a reference for this, or other examples of something similar?

According to the story, the clock was pulled after just a few weeks because it was too stressful.