Are you an introvert? Then put your hands in the air and wave them like... on second thought, better just keep those arms at your side. You don't want to draw any attention to yourself.
The good thing about being an introvert at a party is that there is no way you'll fall asleep and have inappropriate things drawn on your body. Your social awkwardness acts like caffeine. The people in this video, unfortunately, enjoyed themselves a little too much, and their friends made sure they'd wake up to regret it.