Master of the Thumb
This game is played in conjunction with any other game during the course of the evening. It is very simple and easily adapted.
The game starts by picking the person who will be the first Master Of The Thumb. While sitting around the table having a good time, the Master Of The Thumb can, at any time s/he chooses, non-chalantly place her thumb on the edge of the table. After she has started this, anyone who notices must follow example. The last person to place his/her thumb on the table loses and has to drink, but they do become the new Master Of The Thumb. If anyone places their thumb on the table without the real Master Of The Thumb starting it, they have to drink.