The Coughing Game

My friends in Physics and I have invented a new game for use in Lectures.

The first thing that one notices when in a lecture is the number of people in the lecture itself. Now this is understandable, as there has to be everyone doing the course in the room at the same time. However, there are things that, if like me you have a short attention span and get distracted on the tiniest things, you notice pretty quickly.
Like that there are acceptable and unacceptable times to cough during the lecture. This period of acceptablility always begins when there is a lull in the speaker's presentation, and continues as long as people carry on coughing. From this, a few of us have devised a game to play in particularly uninteresting lectures, like the one on significant figures we were in when we thought this pile of bullsheet up. Here are the main rules:
1/ The idea of the game is to keep the coughing going continuously for as long as possible.
2/ A player may not begin the coughing spree, but must wait for an NPC to cough.
3/ A player may cough for no more than 3 seconds (not measured, just by observation), after which another player should begin, continuing the chain. Unless a player is actually choking, in which case forget the game, save yourself by coughing as long as necessary.
4/ Should 2 players cough simultaneously, or a player and NPC cough simultaneously, the chain is broken and the players must start again when another NPC coughs.
5/ As a rule to allow NPCs to continue to listen, coughing must remain at a reasonable volume, loud enough for players to hear it but not so loud that it disrupts everyone else. Penalty shushes will be handed out.
Our current record is around a minute, but that's just because some guys doing the lecture still had Freshers' Flu. Give it a go when you're being taught something you could do in your sleep and report back if you find it fun =P