I stupidly thought it was a post about someone having made an Observation of a zombie, likely because of having read this thread. (Who’s not the sharpest knife in the drawer? It’s me, Lucy.)
OK, a quick blow to the head with a cricket bat got rid of that observation. (Shaun of the Dead is so good)
We don’t know how it happened, but the observation was deleted from the database but not the search index. It’s now been removed from the search index.