Take a brown paper bag for groceries. Fill it with shaving cream. When she goes into the bathroom take the open edge of the bag and slide it under the door. When you hear her get up and come to the door smash the bag with your hands. It will shoot the shaving cream all over the inside of the room. The other ones we did in the dorms was to take the cardboard that you get from a frozen pizza and cover it in lighter fluid. Light it on fire and skim it under the crack in the door. You will hear them stomp it out....