Young Mr. Krabs and young Plankton are at the beach and they have finished building a sand castle. Thereupon, a bully/show-off fish points at his sand castle saying "This is a castle!" The bully/show-off fish then destroys Mr. Krabs' and Plankton's sand castle and says he's remodeling it. Mr. Krabs and Plankton smile at each other and the bully/show-off fish wonders what they are all happy about. Suddenly, the bully/show-off fish gets launched into the air by a secret spring trap under the sand. Young Plankton states "Bullies are so predictable" as the short ends.
The sand castle looks similar to the other sand castle in "A Life in a Day."