I would be so effing excited, but at the same time I would be nervous as hell. I'd definitely be thinking of how to make a good first impression on my fellow HM's, and worrying about whatever the launch night twist was going to be.
But then I'd realize that it's the last BB series and I don't have to care what other people think about me, and then I'd just start getting pumped to get in the house, be myself, live it up, and enjoy things. Bring it on BB!
