So lately I have my laptop hooked up to my TV. Which works great but one of my cats liked to sit on the keyboard. She managed to flip it upside down. Well, if you're using Windows 7 to fix said mistake you just need to hold Crtl+Alt+Up arrow key to flip it back to the correct orientation. Hitting left or right rotates it the corresponding 90 degree angle.
I had no idea you could do that and was a little surprised when I saw my screen upside down.