To be honest, ghost vikings are probably pretty terrible to run into.  Besides being a ghost, vikings are hardcore, and would probably just quickly axe you a question by literally axing you.  

Ghost pirates would also be fairly terrible, although ghost serial killers would probably be worse.  

We could debate all day about who, as a ghost, would be terrible to run into, but why focus on something that’s fictional, but would be a worst-case scenario?  

If we’re going to talk about who we wouldn’t want to meet as a ghost, why not think about who we would want to meet as a ghost?  

Instead of worrying about the worst-case scenario if the November election doesn’t go your way, why not focus on doing what you can to make sure it does go your way?