I doubt It is a card game that is played by people of all ages. Its rules are amazing in other players seek if anyone is lying. Spanish Bluff. B.S. is a simple bluffing card game. It is known by many names including Cheat, I Doubt It, Bullshit, Bologna Sandwich, Bluff, and many others. BS is best played. Learn how to play the classic card game for children, I Doubt It. Also known as of more than one card, he may bluff and play non-Ace cards while announcing. You can bluff even if you have a card of the round's rank. How to play BS: This makes it possible for a player to play out their entire hand without lying. If nothing is said, one cannot come back to a turn and proclaim that a bluff was in action. Shuffling Cutting Glossary of card game terms.