Okay, I can't believe I'm trying to explain this, but otherwise I'll hurt my head banging on my desk.
* Stand up in your room and face a door.
* Turn 90 degrees clockwise, and you're now facing a different direction.
* Turn another 90 degrees clockwise - this is the same as turning 180 degrees clockwise from your initial orientation - and you'll now be facing the opposite from the door. Your back should now be facing the door.
* Turn another 90 degrees clockwise - this is the same as turning 270 degrees clockwise from your initial orientation.
* And finally, do another 90 degree clockwise turn - this is the same as turning 360 degrees clockwise from your initial orientation. Note how you're now facing the door again - you're back at where you started.
And by the way, it's spelled scorpion.