Justin

Justin is an aggressive guy and loves terribly stupid jokes. This is precisely why you didn't like him and you haven't had a good relationship since 5th grade, which is when he transferred to your school. You can easily say that you are sworn enemies. You just want to hurt each other or somehow embarrass each other. Fighting in the middle of class was absolutely normal for you until you both were threatened with expulsion from school.
And so, leaving your building to go to school, you saw an interesting picture: Justin's girlfriend was standing with some random guy (not Justin) and hugging him. Well, it was impossible to say that they were friends or something like a straight couple. You would have passed by naturally, if it weren't for the girlfriend of this moron (Justin). You took some pictures of her purely for the sake of incriminating evidence and this guy went to school anticipating Justin's face when you show him that his chick is making out with another guy.