http://www.nieuwsblad.be/article/detail.aspx?articleid=dmf20140320_01033835

Brilliant idea from teacher to get his students still
Thursday, March 20, 2014

A mathematics teacher with a stroke of genius made an end to the annoying chatter of his students.
When his disciples were chatting a whole lesson, the teacher asked who watched Game of Thrones. Nearly everyone raised his hand. "Well, I've read all the books," the teacher replied. "If there is another too much noise, I write the name of the dead on the board. "They are there enough to fill the whole year and I can even describe how they die."

When some students took the threat seriously, the teacher wrote the prompt killing of the third season on the board. Then it was quiet.

It is a student who is doing the story on the French site http://danstonchat.com/ so the story is difficult to control, but it is in any case a brilliant idea.