The thought of staying behind for detention is usually enough to stop most kids misbehaving.
But pupils at a school in Derby also have to listen to classical music if they're kept back after class.
Their head teacher reckons it calms kids down and stops them breaking the rules. But does it work? Leah's been finding out...
"When I was at school I'd often get in trouble for chewing gum in class and I always got caught by the teachers! So to make me think about my bad behaviour I would have to write lines.
So I was really surprised when I found out there was a school in Derby where children would have to listen to classical for two whole hours!
If you get in trouble at this school, first of all you get a warning from a teacher. If that doesn't work you have to copy a poem, and then the last resort is Friday after-school detention with the company of classical music.
Head teacher Mr Walker told me he decided to roll out the idea to give children a chance to think about their behaviour. But does it actually mean fewer kids are less likely to muck around in class?
Chloe and Yasmin reckon they have better things to do than spend two hours after class listening to classical music.
It's fair to say that they're not massive fans of that kind of music. But interestingly they say it has certainly put them off being naughty in class.
Thomas reckons the music is quite relaxing and says it's calmed down some of the naughty kids in school.
I'm not sure I would have coped so well with classical music during such a long detention. But I think the idea could really catch on at other schools!"