Some-one is in love. You should hit her on the shoulder shriek; run into your room and fall on your bed. Now while this is happening shriek and pull your hair up, up in the sky and slowly start to remove those super stylish clothes, starting with your socks. Now once you have removed all of your clothing and are rolling like a ball with your hands behind your knees, let her know how you feel. Things will change immediately.
(yes, this happened to me in college...they're married now, so congrats to them....gross)