Conch signal
The Conch Signal is an object that was apparently once used by Mermaid Man and Barnacle Boy. It is used to call the heroes when help is needed. Long after the heroes used the Conch Signal, it was given to the winner of a TV Mermaid Man and Barnacle Boy-related contest, who happened to be SpongeBob. He then used it to call the heroes many times, even when there was no real danger. It only appeared in "Mermaid Man and Barnacle Boy II."