Her mind still reeling from the shock of what she was seeing, Sarah momentarily forgot how to respond.  "Oh, uh, I'm...  I'm Sarah," she told her.  Then she shook her head.  "Wait, why am I introducing myself to you?!" she shouted.  "Who are you?  Why and [i]how[/i] did you get into my apartment?  A-And just what do you [i]mean[/i] you'll be staying here?!  You most certainly will [i]not[/i] be!"  She pulled open her door and pointed outside.  "Now get out of here before I call campus security!"