I'm running Mac OS X 10.4.3 Tiger. When I triple-click the title bar of a window, it quickly minimizes and quickly maximizes again. How would this ever be useful? Does someone who is minimizing a window suddenly in a millisecond realize that they didn't want to minimize it so they throw an extra click in there to maximize it again? It seems to do it in the Finder. I haven't tried it on ALL apps but, Safari doesn't do it.
Try it in the Finder... Quickly click 3 times on a titlebar in the Finder.
Edit: It works best on Genie effect. I think scale is too fast to make it happen. You must click pretty rapidly.
Edit: Works in Illustrator too! Maybe it's just for Carbon Apps?