One of my twins had a girlfriend that he wanted to break up with when they were teenagers. The twins both went over to her house. Every time she left the room, they switched shirts and hats. When she came back, one of them would sit on the sofa next to her and put his arm around her shoulders. She got all confused. After doing this several times, she finally figured out who was who and that they were messing with her. She ran crying to her room, locked the door, and refused to come out. That was the end of the relationship. She never forgave them for that one.