If, during the deal, a player (player 1) thinks he sees another player's card (player 2) and calls it out, does the player receiving the card have the obligation to show it and turn it in for a replacement?
If player 1 saw it correctly, does player 2 have an obligation to turn it in or can he play it with people possibly knowing the card.
But what if player 1 saw it incorrectly. Can player 2 look at it and say "You're wrong," or merely "I am keeping this card" and keep the card?
What if player 1 did see it correctly, and player 2 merely wants to keep the card? Can he lie by saying "You're wrong," or merely "I am keeping this card"?