 When Plankton decides to open his Chum Bucket restaurant for 23 hours a day, Mr. Krabs decides to open the Krusty Krab for 24 hours because he d never be able to live it down. And that was Plankton s plan exactly. When SpongeBob finally cracks from exhaustion, he might be able to tell Plankton the secret formula/When Mr. Krabs decides to visit his ol  navy pals in a reunion, he loses his shell just like that. So SpongeBob decides to take his place.