The musical stage version of “How the Grinch Stole Christmas!” opens at the Wang Theatre on Friday. A few weeks ago, the “Grinch” company was in Boston drumming up interest in the show, and when I was offered the opportunity to be transformed into the fuzzy chartreuse beast who is as “cuddly as a cactus, as charming as an eel,” I was more than ready to externalize my inner self.
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