Like the card game of the same name (AKA "I doubt it."), which plays on the joy of lying and the fear of discovery. Mark Twain described lying as "a recreation, a solace, a refuge in time of need, the fourth Grace, the tenth Muse, man's best and surest friend." It is also a fundamental language skill that should not be neglected.
- Give every player 5-15 blank index cards.
- On each of their index cards, players should write a sentence that is either true or false, being sure to include at least one false sentence. They should be careful not to reveal which sentences are true or false.
- Players then take turns laying down a card and saying the sentence out loud, always as if the statement were true.
- Other players can ask for the sentence to be repeated.
- If a player believes the sentence is false, s/he can call "bullshit!" (Or, more delicately, "I doubt it.")
- The player who laid the card then has to reveal whether the sentence is true or false.
- If s/he was lying, the doubter takes the pile of previously played cards.
- If s/he was telling the truth, the player takes all the cards.
- Play ends when a player gets rid of all her cards. Players then count how many cards they have. The winner is the person with the most cards.
The sentences can be about the players' personal history, e.g., "I once worked as a cowboy" (true), or related to another topic, like "There were two melted reactor cores at Fukushima Dai Ichi." (false, three) They should be factual, not questions of interpretation or opinion (though the latter might make for an interesting variation). Disputes can be settled via wikipedia on a smartphone.