Pointless Mac Tip 1: Invert Your Display
Apple, Guides (0)
Using the keyboard shortcut Ctrl-Opt-Cmd-8 you can invert your display. A very pointless exercise, well okay I can think of one use; wardriving. Another use could be to see if the 'geniuses' in the Apple store actually know a thing or two about Macs.
I wonder if you can invert the displays on the iPhone or touch?
(Note: Try taking a screenshot when you've inverted your display (Cmd-Shift-3 or alternatively), weird huh?)