Hasow miel couin lieny jouinos ouyn lopiun!!
You should always end on a note that’s likely to stick in the reader’s mind.
Answer:
The complete subject would be SpongeBob SquarePants's best party trick.
Explanation:
The subject, or thing completing the action, is SpongeBob SquarePants. But the complete subject would be his best party trick because it gets into one of his distinct attributes.