Here is a pretty useless tip. You can invert the colors on your Mac’s screen by pressing ctrl+option+command+8. Yeah, it looks kind of cool, but thats about it. It doesn’t serve any real purpose that I am aware of.
The only use I have ever found for it, was as a prank. When Best Buy first started carrying Macs, which was around Christmas time, I decided to go have a little fun with them. I went around to their whole section of about 6 Macs and very quickly inverted the colors on all of them while no one was looking. When they walked back through, they were dumbfounded. One employee called another over for help, and before you know it, there were about 5 Best Buy employees standing there confused as could be. They were all trying to fix them, but I knew none of them had any idea what to do. I stood there with my friends tucked away in the DVD section laughing at them for a few minutes. Luckily for them, it reverts back to normal when you reset the computer. Go have fun with it and stump your friends.
-Image courtesy of wikiHow
I think it can be used to find dead pixels since it’s flashing the entire screen so you can see which pixels are broken.
Maybe?
The possibility of inverting the colors is actually a very clever one… it’s for the colorblind… when looking at a document or website where the text can’t be read this feature may come in handy…
Saves some wear on the eyes.
And if it works like blackle.com, it saves wattage. I think.