The second story was just pointless - spoiler
So we had Karen playing two parts. An frumpy young woman, and her disrespectful, outrageous ***ty 'sister'
Now we could all see it was Karen was playing two parts. It was her movie and she was in all three stories. And it is a horror movie, so it's unlikely they were really 'twins', or 'sisters'.
So she had to have a double personality. Therefore the brain-dead 'twist' at the end was just a waste of time. I knew it as soon as the story started.