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. Bullshit is a card game to teach those to bluff their way to the top and even learn the skill to pick when someone else is bluffing. Also known as 'Cheat', 'I Doubt It'. 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.