The other day I was messing around with my laptop and inadvertently hit a combination of keys that rotated my screen right by 90 degrees. I had seen this facility a long time ago and I had forgotten what the keystrokes were.
Inevitably what followed was a rapid googling of the appropriate keyboard shortcut to restore normality. The shortcuts are simple, fairly logical, and I include them here for your convenience. You never know, you might actually need to rotate your screen around one day…
CTRL + ALT + Up Arrow – Normal View
CTRL + ALT + Down Arrow – Rotate by 180 degrees (upside down)
CTRL + ALT + Left Arrow – Rotate Left by 90 degrees
CTRL + ALT + Right Arrow – Rotate right by 90 degrees
Note: apparently the shortcuts can vary and depend on your graphics card manufacturer, some seem to respond to CTRL + SHIFT + R.