OS X
Close all Finder Windows
Close all Finder windows at once by holding option and clicking the close (red) button, or by typing option-command-W (command is the apple key). Other silly party tricks include: minimize a window in slow motion by holding the shift key and clicking the minimize (yellow) button. Now let's get even more useless: open several finder windows (command N a few times), hold option-command-shift, then click minimize.
