Mac OS X: There are plenty of ways to force quit an application in OS X, but you can do it quickly from the keyboard with this simple key command.
When the application currently in front is freezing you up or giving you grief, hold down Command-Shift-Option-Escape for three seconds and Mac OS X will gladly kill it for you. You don't need to go to any menus, bother to use your mouse, or jump into the terminal. Hold down those keys, wait three seconds, and you're done.
20 OS X Keyboard Shortcuts You Might Not Know [How-To Geek]
Republished from Lifehacker