Not exactly Halloween, but a recent production of "Candide" in Chicago had the "sheep" that appear in a late scene of the show (when our hero lands on El Dorado) dressed as "DOND" models with sheep ears and woolly hair, complete with briefcases (numbers 7 and 13, if you must know). The only rewrite of the book was having the governor shout "Deal!" at one point. (Of course, I realize that there are perhaps only two other regulars on this forum who will understand what I'm talking about.) Unfortunately, they did not consider rewriting Hugh Wheeler's book to have Candide say, "Hello, sheep!" and have the sheep answer "Hi, Candide! Baaaah!"