Stop Mac OS X from shutting down by quickly launching an app
If you’ve ever accidentally shut down your Mac you’re not alone, but did you know that you can stop the shut down process by quickly launching an app? This works best when you act quick, so just pick any app in your Dock and launch away. You’ll get an error message saying “The application ____ canceled shut down.” which completely halts the Mac OS X shutdown process.
Nice huh? Hats off to Lifehacker for the tip.