The Magic Conch shell is a lavender-colored seashell, and has a speaker inside it to help the toy and users communicate more effectively. It is operated by a pull-string.
Role in series
SpongeBob and Patrick ask it questions, pull the cord, and do whatever it says. It serves as the head of their club. Later in the episode, Squidward asks it numerous times for food, which it gave SpongeBob and Patrick, but the Conch continually answers "no," infuriating him. This was mostly likely due to Squidward insulting the conch and the club earlier in the episode. If it happened because of that, then this means that the conch is sentient.
SpongeBob's Truth or Square
I can turn into a skyscraper!
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It, along with several other objects, can be seen on the floor of SpongeBob's house when SpongeBob is bored.
This list of answers given is ordered by appearances in the episode: