We have had instances where a user mistakenly presses a key combination on their keyboard and the orientation of thier monitor goes from wide to long (sideways). This is a feature of newer computers so that you could take advantage of using a widescreen monitor sideways for display purposes.
The trick to making it work (or undoing it!) is to hold down both the Control and the ALT key and one of the arrow keys(CTRL+ALT+arrow key).
A few persons in the organization have accidentally had the misfortune of this happening to them and after having a coronary and getting it fixed, they have decided that it would be fun to pass along the anxiety. THIS IS HOW YOU COUNTER THEM!!!!! ;-) Be one step ahead!!!