The Krusty Krab is a restaurant that sells various fast food products at extraordinarily high prices, including the popular Krabby Patty burgers. Typical of the series, there are inconsistencies in the origin of the restaurant's name; in one episode, it is stated that the Krusty Krab took its name from the Rusty Krab, a retirement home in Bikini Bottom acquired by Mr. Krabs and converted into a restaurant. but in another, the restaurant got its name from a pirate ship named the Krusty Krab, which Mr. Krabs also owned. The Krusty Krab is one of the most successful restaurants in Bikini Bottom. The Krabby Patty formula is a closely guarded trade secret, and rival restaurateur Plankton's futile attempts at acquiring the secret formula (as well as the often absurd lengths Mr. Krabs will go to protect it) is a major recurring theme throughout the series. The Krusty Krab usually attracts customers from Bikini Bottom because of the Krabby Patty's renowned taste and the fact that Plankton's restaurant, the Chum Bucket, has a menu consisting of mostly inedible chum. Because of this lack of viable competition, Mr. Krabs is free to engage in price gouging, which he usually does. Sometimes The Krusty Krab is shown to have a drive-thru seen in "Driven to Tears", "Drive Thru", and The SpongeBob Movie: Sponge Out of Water. It was noted that the Krusty Krab is clean and disease-free.