Given the interest that you show for the topic I assume that you don't need any further explanation on the matter...

This is a technique used by one of my high school teachers when her class had been out of control too many times on a row. I have personally used it once with a 12 years old child and it has worked out very well. I am aware that it is an extreme technique that shouldn't be used but in certain situations and being aware that it might be counterproductive when used wrongly. It basically means that you reckon a certain unit or topic as finished (there might be an exam or not) given the interest the class is showing for it. For instance, my teacher use to start reading the paper at her desk and when there was a deep and tense silence all around she would state:; “Don't worry lads, you can keep on talking. We have plenty of time since it is not necessary to explain anything else on this unit”. What I think it makes it interesting is that makes people realize that it is nobody but themselves who is missing something. In case there is an exam (or even if there is no exam) it is important to make clear that this is no punishment of any kind but only the natural consequences of rejecting your teacher's help with a certain topic.