Farside leans towards lightly silly at times and let's the readers make up stories deeper behind the single frame.
It's basically making a long elaborate story about a ghost and it simply fell in these rather regular people's bean dip.
It leaves plenty to your imagination. You can decide what is going on. Will there be more haunting? Will the just make more bean dip and carry on? Why was only the wife pointing?
Have fun with your own imagination and decide what happens next or what led to this moment.