Each player has their own individual sign. This could be a hand over the face or scratching your nose. As long as it is different to everyone else. Everyone has to tap on the table during the game until they have to make their sign. One person starts by making their sign and then the sign of someone else. This next person makes their sign first and then another persons... there is no order to the way this is done and so the chain is carried on until someone breaks it. The first person to take too long to reply with their signal or makes a mistake has to have a shot or three fingers of beer. It is hard er than it seems, especially when drunk.