Cork

A cork is found at the end of SMB2 (Super Mario Bros. 2) when you defeat the boss: Wart. There is a vase filled with Subcons (Inhabitants of Subcon). On top of the vase there is a cork that acts as a lid to keep the Subcons from getting out. When Mario, Luigi Princess Peach or Toad defeat Wart they go to the outskirts of the castle and find the vase. They then pull the cork off the vase and the subcons fly out and the game ends.