Here is a great way to annoy your friends when it is their Birthday, with this fun Gift Card Puzzle Vault.
Just put a card inside the Gift Card Puzzle Vault, give it to one of your friends and they will have to solve the puzzle before they can get their birthday card.
Of course they could just take a hammer to it to get the card out, the Gift Card Puzzle Vault is available for $4.99 from Think Geek
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