Naughtiness has been on the upswing lately as spring has arrived.  I was having a conversation with a student from another class about this very thing when I learned that idioms don't always translate well when conversing with third-graders...

Student:  Have your kids been bad, too?

Mrs. B:  No, I brought the hammer down the first time they tried being naughty.

Student:  You should bring the hammer down on their knee.

Mrs. B:  Oh?  And what would that do?

Student:  (pause)  Well, it would teach them a big lesson, that's for sure!