A ritual to be performed when a fart is smelt. The first person to smell it must put their thumb to their forehead in silence. As more people notice either the fart or the people with their thumb to their forehead, they too must put their join in the gesture. The last person to do so must breathe in the entire fart. There is, however, every chance that more that one person will be oblivious to the gesture, so true professionals simply put their thumb to their forehead and carried on working, so as to look cool and disinterested, yet still not losing the game.