Is it possible to create a keyboard shortcut in OSX Mavericks to kill/hide notification center alerts (and speed up hiding banners that already disappear after some time automatically)?
EDIT: I used Terry's "nuke all" AppleScript (which has the added benefit of not throwing errors if notifications don't exist), saved to Documents and Compiled, then moved it to Library/Scripts/ and downloaded a free copy of FastScripts to assign a keyboard shortcut.