What good classroom management looks like.  If there’s one thing you should know about managing a classroom, it’s that you’ve got to have at least three things at the ready: your respect for your students (that you actively show them), their respect of you (which partly comes from respecting them), and a willingness to drop the almighty hammer on them (KABOOM).  

But what they don’t tell you before you start teaching is that if you can get the first two in line (mutual respect) then the kids will actually want you to drop the hammer, and will look to you for it.  They will be waiting patiently for you to step in when a classmate of theirs is out of line because at the end of the day kids want to learn.  In fact, if there’s a student in the room who is preventing every one else from learning and you don’t do any hammer dropping, they will quietly resent you at best, or hate you at worst. 

Knowing when to drop the hammer and when not to takes practice, but it’s got to be in your tool-belt.  Don’t be afraid.  Make it rain.