What’s in a ghost’s nose? Boo-gers. OK, but it’s allowed, because it’s Halloween season, and we’re talking about horror movies. Specifically: Why do people love them so much, and what goes on in our brains when we watch scary films? Far from the world of real-life nasties and romantic flicks (yuck!), horror movies may serve an “evolutionary purpose,” one psychiatrist tells me. Meanwhile, a biopsychologist suggests watching scary stuff onscreen makes us “more resilient in everyday situations.” Watching horror films taps into ‘ancient survival instincts’ and serves an ‘evolutionary purpose’Scary…