Yell out "WHO'S THERE?" in a manly voice.
From Create Your Own Story
You notice that the person in your house stops making noise. You realize that he or she is going upstairs. So you strip down and put your powers to work. You sometimes wish that you didn't have to go naked to go invisible. But you have to, otherwise people will see you. Your clothes won't go invisible with you. By the time you go invisible, the person is in your room. It's a man. He is wearing a black balaclava, holding a metal bat.You notice that he is very muscular as well. But it doesn't distract you. It looks like you have to fight him. Where should you start?
