Most unexpected scene? That random nod to Britney Spears at the end of the episode. I'm not sure what the message was supposed to be, but an obvious Britney clone was checked into the rehab center, went to her room, snorted some coke, and shaved her head.
I think everyone needs to just stop obsessing about Britney, personally. lol I mean who CARES if she shaved her head?? Maybe her head was just itchy, like Pedro. :-)