First published on 30 May 2012. Updated on 22 Aug 2012.
The aim is to get rid of your cards by lying like a champ. Lay a selection of your cards (of the same number) face down on the pile and state what they are. Your fellow players will either believe your ruse or call "bullshit". If they're right, you'll be stuck with the deck and a penalty swig. If your honour is intact, your accuser takes the hit. Best practice your poker face.