Do you sometimes click the wrong icon when choosing an application from the dock? Instead of waiting for the application to launch before quitting, use this handy shortcut. As soon as you the wrong icon, right click on it (or CTRL + click), and select force quit. This will allow you to kill it before it slows down your system. If you aren’t quite as quick and the application has started loading, sometimes the contextual menu will say QUIT instead of FORCE QUIT. To avoid this, hold the OPTION key and right click (CONTROL + OPTION + click), and FORCE QUIT will appear.