Jason had been nagging his new girlfriend Jessica to wear something really racy to the company Halloween party with him; maybe a really skimpy witch costume or something. Jessica’s older sister Sally Owens went ballistic, and told him he was giving witches a bad name. She said that Jessica wouldn’t be able to make his company party, but if he was looking for a girl in a racy costume for Halloween, she could fix him up.
Jason’s memory of the company party is a little fuzzy. No one seems to remember him there that night; but they tell him his sister looked really hot in her Bride of Frankenstein costume. Funny thing is, Jason doesn't have a sister.