In the opening moments of “Hairspray,” bubbly Tracy Turnblad bounces down the mean streets of her hometown belting out “Good Morning, Baltimore.” Pausing at a trash can, she sings to three sniffing rats as if she were Snow White twittering to bluebirds. A moment later, John Waters, whose 1988 “Hairspray” inspired the Broadway musical that spawned this film, appears in the greatest cameo ever …
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