Press CTRL + ALT + the up arrow key (see below)
Next press CTRL + ALT + the right arrow key
Then press CTRL + ALT + the left arrow key
Then, before you get too dizzy press CTRL + ALT + the down arrow key
Pretty neat??? Now remember that a 7th grader showed me that after I had spent 5 minutes trying to fix a monitor that was set upside down by another student. You will inevitably find that often the kids are ahead of the adults when it comes to computers. It’s OK, that’s just the way it is.
At least you know how to flip your screen back if anyone messes with it.
And if this activity didn't work on your computer it just means you might have a different version of Windows (other than XP, 7, 10) or this particular feature may have been disabled.