Big Brother Comeback

You live together with your big brother in a flat share. He is quite the tyrant. Fortunately, he has been on a world tour since yesterday. This was a reason for you to celebrate. Without further ado, you've turned his room into a party room and celebrated extensively. But now you have a massive problem. Your brother just called and announced that he is on his way back. His flight was cancelled. He'll be there in an hour. By then, the room has to look like it did before the party, or else there will be big trouble. You have a lot of crazy things to do and many surprises await you.