Mermaid Man and Barnacle Boy Trading Card No. 54
The Mermaid Man and Barnacle Boy Trading Card, No. 54 is a special trading card of the Mermaid Man and Barnacle Boy Trading Card Series. There are only 5 in existence, and to get one you have to buy packs of cards, and hope you get lucky. Patrick Star got a pack filled with 5, although there was one on display at the Near Mint Comic Book Store, that means there were 6 in existence, so possibly that the store owner was lying so SpongeBob would buy more of the cards. Patrick used one of the cards to do many things, such as opening his house, cleaning a grill, flipping patties with it, and using it as a napkin. He also had it the fold of his back at one time. He gave the other four to SpongeBob, but needed to use one to open his house again. It was only seen in The Card. It seems impossible, but the card is actually animated. Here's what the card says:
Voice: Mermaid Man says!
(A giant fist comes into the scene. Mermaid Man ducks, so the fist punches Barnacle Boy instead)
Mermaid Man: Buy more cards!