The fourth sentence is correct.
Study this carefully and re-think the other sentences.
http://grammar.ccc.commnet.edu/grammar/marks/dash.htm
adding dashes where needed
There was a loud boom -- what a fright from the back of the theater.
We all turned around -- I even jumped up to see what it was.
It was part of the play -- imagine that meant to add suspense.
I'd love to see the play again -- maybe next week -- and bring Andrea.
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