I Doubt It
Deal a deck of cards out until no cards are left.

The first player, the person to the right of the dealer, discards between one and four cards, face down. If the player discards two cards, the player should say that the discards are two aces. This may or may not be true.If another participant calls out, “I doubt it!” the player must turn the cards up. If the player didn’t tell the truth, the player must take the cards back in hand. If the player did tell the truth, the other participant must take the cards. If no one doubts it, the cards remain face down.The next player takes out between one and four cards and states that the discarded cards are twos. If someone doubts it and the player was telling the truth, the “doubter” must take all of the cards down on the table, including the cards from the previous round if the aces were not called. If the player was not telling the truth, the player takes all of the cards.This progresses sequentially through the deck. Remember that a player who has been untruthful or the person who doubts a truthful statement must take all of the cards down, even the ones that were not doubted.The player who gets rid of a hand first wins.

The Klutz Book of Card Games: For Sharks and Others