Monitor Turn Upside Down?

How to deal with a monitor that have been turn upside down?
Not physically turn upside down but 1 of the trainer did some clicking and wallaaa..
cannot be figured out....
it happen on our training class at Melaka last week..

First rule
Dont panic...!
Laugh as much as u can and try to figure how its done....
Hehe...

1.But then turn the monitor upside down (easy to see the screen)
2.Right click at desktop,properties,setting,advance...

Choose Rotation....
Done!
Easy right?