Would you like for your students who are making bad choices to learn from their behavior while being punished? Have them copy the motivator. After a few times, they will quickly decide to make a good choice just at the mention that of the words "The Motivator".
I would suggest that you read over it with your class and discuss any terms or language that they are unfamiliar with. You could even send a copy of it home after the offense for the parents to sign and return if wanted.
This was shared with me by a fellow teacher, who had received it from another teacher. I searched all over the internet for it before school started and could not find it anywhere. I retyped it and am sharing it with you because it is so well written. I hope it helps your students self correct those bad choices!