Similar to the Major, a couple of brew sessions ago I started the cold water through my IC.
I don't have a pump to do the re-circ process, so I just let the cold water run for a few minutes then start stirring the wort to keep it circulating in the kettle.
Looked over at the kettle in about 10 minutes and noticed the blue flames under the kettle!
Was surprised, as the Major noted, that even with the flame on, the temp had dropped by 40 degrees!