If you want to have some real fun, take a snapshot of someones desktop, delete all the desktop icons, and save the snapshot as the wallpaper.

So! YOU are the one who publishes screen shots which include the red "X button", with the full knowledge that the people looking at it will frustrated as they try to close the window by repeatedly clicking on the image button instead of the OS one. Admit it!
Of course I would never click on the wrong button.

I do admit to standing at a street corner and pounding away at the "Press To Walk" button just to make sure the lights really do change (and I have a technical background too).
Then I step back and watch the guy behind me step forward and do the same.
In our defence I must say that the pedestrian lights in Darwin city are remarkably consistent and never miss a beat - thanks to efforts of a whole group of pedestrians like me.
Windows 7