I left my 2-year-old with my Mac for five minutes, and now the entire display looks like a film negative! How do I change it back?
Your tyke must've mashed the right four-key combo (Control-Option-Command-8) to invert your screen colors. Press that combo again to set things right, or open System Preferences > Universal Acess, and under Display, toggle White on Black back to the default Black on White.
Pro-tip (for the pros): This also makes a good prank!

Whoa, I gotta lay off the fried cheese.
EARTHBOUND!
Submitted by Ernest Phillips (not verified) on Thu, 2007-12-13 11:45
GREAT reference! Best game EVER!
EXCELLENT
Submitted by Anonymous (not verified) on Thu, 2007-12-13 14:19
Another completely random yet awesome tip about OS X/Mac. FUN. Thanks.
NegativeLand
Submitted by Carel (not verified) on Thu, 2007-12-13 16:22
Now I can use this as a prank using Remote Desktop...
Thanks,
Carel.