Dead Man's Hand

 is a challenge added in the Fallout: New Vegas add-on Dead Money.

Requirements
Collect the dead man's hand in Sierra Madre playing cards.

Effects
Grants 100 XP.

Locations

 * The Ace of Spades is found in the fountain where you first wake up and where you gather your team.
 * The 8 of Spades is found in the back of the cell Dog is located in at the police station.
 * The Ace of Clubs is found behind the curtain in the theater where you confront Dean.
 * The 8 of Clubs can be found in the Cafe Madrid, on the floor to the right of the terminal.
 * The Queen of Clubs is located in Vera's Suite.

Bugs

 * Dropping one of the cards and picking it back up again will increment the card count, effectively removing the need to pick up at least one of the additional cards in the hand.
 * This exploit is only possible if the cards are somehow not automatically added to the player's Caravan deck when initially picked up.
 * Alternatively, repeatedly dropping and picking up one of the cards will cause the challenge to be completed (I did this with only the ace of spades, dropped it and recollected it four times and the challenge completed).
 * The card count may not be increased when first picking up a card in the dead man's hand.

Behind the scenes
The "dead man's hand" is the poker hand purported to be held by Wild Bill Hickok immediately prior to his murder. Although the "aces and eights" combination is widely associated with the hand, the fifth card often differs depending on the account. The Queen of Clubs is claimed to be the fifth card by Ripley's Believe It Or Not.