Did you know you can turn your screen without tilting your laptop?

Did you know that if you hold down CTRL + ALT and then press an arrow key, your screen will turn that direction?  For example holding down CTRL + ALT and the down arrow will turn your screen upside down.

I don't know what the practical reason would be to do this, but it is kind of fun to do.  Just remember that the up arrow will turn your screen right side up.