Mrs. Puff is an anthropomorphic pufferfish, specifically a porcupinefish, who owns the underwater boating school that SpongeBob attends. Despite her efforts, she has been unsuccessful at teaching SpongeBob how to drive a boat. He is her most committed student, and knows the answer to every question on the oral exam, but panics every time he takes the driving part of her course. He often crashes her vehicles and causes town wide destruction in the process. Mrs. Puff displays the pufferfish's inflation defense mechanism when she is scared or when SpongeBob crashes, akin to a car's airbag deploying.