Hit the Escape key (esc, at top left of keyboard) instead of mousing to and clicking on the “Cancel” button in any dialog box. Bonus Shortcut: Enter (or Return) almost always clicks the default button (the one with the heavier border) in a dialog box. Double-Bonus Shortcut: Command-D almost always clicks the “Don’t Save” button.
Got 60 seconds? Learn something about the Mac.
Visit my One-Minute Macman website!