There’s no end to the fruitbat craziness of former Cheers star Kirstie Alley. I dare say if there’s ever a “Cheers” reunion, these Tweets she issued recently won’t earn her an invitation. Didn’t you wonder why Sam would never go near Rebecca, that they had to keep bringing Diane back for him? I think this — and Alley’s devotion to Scientology, which has just about wrecked her career — will explain it. Kirstie wants to know who the Whistleblower is NOW. “We might as well play gossip with ghosts,” says the Xenu-trained philosopher. Quick, everyone back in the space ship! PS whatever happened to Kirstie’s Scientology-backed weight loss program?