Let's make some rules.

Any parent or teacher will tell you:  teenagers don't like rules.  There's a number of reasons for that, mainly that teenagers are in the process of developing their own advanced reasoning skills.

While younger students are able to see rules as concrete (although of course they don't always obey) teenagers start thinking about rules and consequences for themselves and whether or not they think the rules really make sense.  While at times this can be frustrating whenever you're trying to keep some order in the classroom, it's easy to use this to your advantage.

Get your students involved in making classroom rules.  Letting them think about what sort of rules need to be followed and why helps them to see that some rules are necessary.  Also, allow them to come up with suitable punishments for breaking the rules.  Coming up with these ideas together will benefit teenagers thinking skills as well as provide a, hopefully, more orderly classroom.