Meaning: There was enjoyment and happiness until the moment the clown had an unexpected fall.
Choice of Words: Using the word "It" as a pronoun referring to a previous idea or situation. "Fun" is a noun that means enjoyment or pleasure. "Until" is a conjunction that introduces a point in time or event that marks the end of something. "Clown" is a noun that refers to a person whose job is to make people laugh, typically by wearing a costume and performing silly acts. "Fell" is a verb that means to move downward suddenly and unintentionally. "Down" is an adverb that means from a higher to a lower position.