It’s not often I change my mind about seeing a show. Once it drops off the reviews list it has missed its moment. I was too busy to see spoof psychic Shirley Ghostman’s “Spooktacular” opening night, but when I looked on Twitter and saw enthusiastic reports from comedians whose opinion I respect, such as Reece Shearsmith and Richard Herring, plus a lot of fans excited about it, I thought I’d better check it out. And I didn’t regret it. Who could have predicted that?