Halloween Eve in Gravity Falls, It's a dark autumn evening outside. You are in one of Mystery Shack's small exhibit rooms: lots of homemade and obviously fake stuffed animals of various mystical creatures and things. This house looks like a gift shop and a museum at the same time, and the owners seem to live on the upper floors.

Suddenly, you notice a girl dressed as a goth in a black short skirt and T-shirt who has just walked inside. She heads for the stairs to the top floor.