Water Usage (i.e. Potty Flushes) in Edmonton During the Hockey Gold Medal Game

Via the Freakonomics blog comes this picture of water usage in Edmonton during the Gold Medal game in the 2010 Winter Olympics.

Or, as the newser website quipped "Canada Peed in Unison During Hockey Final". Edmonton, actually.

I've seen such a picture before but I can't remember where.

HT John Chilton.