These are a type of movie shop where you go early, count people in the theater, write down the name of the trailers that play before the movie and rate the audience reaction to the trailers, sometimes by gender. You may or may not have to front payment to the movie, and you may or may not get to stay for the movie. This depends on the MSC and the movie theatre management, to some extent.
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton