As is usually the case, you have some choices. You are angry because you didn't think you deserved to get a "detention" in the first place, so you are doubly irritated by the second one. Normally people outside the situation would simply write you off as a stubborn, immature little jerk and drop the matter, but I am going to assume you are in the process of moving to a higher level, you're capable of looking at things from a more mature perspective, and you're ready to act wisely. The first "detention" was a result of "bad behavior," and you are smart enough to see that for yourself. It's in your post, and it shows you to be getting more shrewd. You made a mistake when you failed to own up to what you did, accept responsibility for it, and deal with the result. You've got a chance, though, to put it right, and I hope you take it. Not attending the first "detention" was another form of "bad behavior," so obviously there were going to be additional consequences. Jumping on "Answers" and looking for someone to agree with you that it's all "terribly unfair" isn't logical or mature. The smart thing to do is to take responsibility, serve out the two "detentions," and work to repair your damaged reputation. You're on the edge of becoming someone marked to do great things, and accepting consequences is one step forward. The other is not getting needlessly into trouble in the first place, so the "bad behavior" must stop. This isn't what you want to hear, but right now is the time to move in a sensible direction. You'll be glad of it ultimately.