Pimm's Box by Matt Pilcher
Do you like winning Every time Read on! 

Pimm's Box is a game to be played with a spectator. TWO boxes -- ONE of them contains an Ace of Spades playing card, the other box contains nothing. The spectator must decide which box is for them and which box is for you. The winner of the game is the person who ends up with the Ace of Spades. Once the spectator has decided which box they want, the boxes are opened. You always win... Yes, that's right, you ALWAYS win. 

PLEASE NOTE: The Ace of Spades is placed into one of the boxes BEFORE the game begins.