My favorite Windows drag-and-drop feature is that if ever I drag a file over the left pane of Explorer on its way to another window, the whole thing freezes up for a minute or so. I think it's polling all the network drives just in case I might decide to drop it there, and since my NAS is turned off (it broke) it just waits until the connection times out. Of course in traditional Microsoft style this locks up the UI thread. I have to remember to drag everything off to the right and then go around.