@Thomas,
I smiled when I saw the Krugman news 'cause I imagined it'd make Thomas very happy. Lo and behold... ;-)
Meanwhile, today I was driving along a parkish area and saw a man dressed in jogging clothes doing something with a very small stream. I watched, a little concerned -- had something fallen in? Was there a problem? As I got a better look at him I realized he was just goofing around -- building a little dam.
Looked fun.