Anyone ever seen this one? Start a game of Minesweeper (the free Windows game.)

Press the following keys: x y z z y then press Enter then press Right Shift

Now watch the extreme top left hand pixel on your monitor, when it's white you're over a safe square, when it's not you're over a mine.

Sort of takes the fun out of it though - but good for impressing people who don't know the trick. :)

Carl