Just had a call from a friend, who does not know how it happened but their display seemed to be rotated 90 degrees to the left.
With certain graphics cards if you press Ctrl+Alt+left arrow it will rotate your screen. It will also rotate it if you press Ctrl+Alt+Right, obviously it rotate to the right, also Ctrl+Alt+Down will flip it upside down.
It's a very simple fix, all you need to do is press Ctril+Alt+Up and your screen should be correct.
I am now wondering how many people will try this on their machines, or will do it on other peoples computers for a little joke.
I am always interested in feedback so feel free to add any comments, or you can mail me here, also if you would like to submit a quick tip with full credit and links back to your site then also feel free to contact me.