While a family dinner can be a daunting prospect, I don’t know that I would call it a horror story. Of course, there is always drama and expertly deployed guilt and passive aggression, but it’s not like a demon is going to crawl out of the walls and eat everyone. The Humans, directed and adapted by Stephen Karam from his own Tony Award-winning play of the same, uses that feeling, that spectre of something waiting to cause harm, to heighten and enhance the drama around family dinner, and it works to great effect.