Boot Your Mac Geek Style

Apple does a good job of hiding all the nerd magic that goes on behind the scenes in their devices and for most people that's a good thing.  If you want to get your geek on and see what your mac is really doing behind that grey fruit, open terminal and type this command.
sudo nvram boot-args="-v"
To return to ignorant bliss type this command...
sudo nvram boot-args=