Blockbuster question?!
Question: What is...
a Runaway hit?
a Sleeper hit?
a Smash hit?
movies of course
Answers: What is...
a Runaway hit?
a Sleeper hit?
a Smash hit?
movies of course
a. A movie which has not been formally released but becomes a hit on its own.
b. A movie which gains unexpected success or recognition.
c. An unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel)
Hope that answers your question.