The Magic Conch Shell is a toy used by SpongeBob and Patrick to answer their questions and is first seen in the episode "Club SpongeBob." It says "yes" to both SpongeBob and Patrick, but not to Squidward.
The Magic Conch Shell looks like a lavender-colored seashell, but has a speaker inside it to help the toy and users communicate more effectively. It is also operated by a pull-string.
Role in series
In "Club SpongeBob," SpongeBob and Patrick ask it questions, pull the cord, and do whatever it says. Squidward asks it numerous times for some food that SpongeBob and Patrick have, but the Conch continually said "no," infuriating him.