Japan got it easy? have you heard about the danish rules?
example
* Bob's mobile calls in the middle of the lesson, he picks it up and starts talking.
(teacher) Bob, will you please turn that phone off and concentrate about the lesson?
(bob) Just a second.... ohh, sure?...
(teacher) bob, turn it off.
(bob) blah blah blah, okay, cya, bye
* bob ends the conversation and puts the phone into his pocket.
(teacher) Bob, go outside the door
(bob) nah, I won't
(teacher) GO out side!
(bob) no.
(teacher) GO!
(bob) nope.
(teacher) grrr. if it happends again, then you will be going to the headmasters office.
(bob) whatever.
Next day it happends again, but the teacher has no power.