Psycho Sister Mackenzie Moss just got done watching a thriller movie and now shes terrified to shower alone in their vacation home. She asks her stepbrother, Seth Gamble, to guard her without peeking. Seth decides itll be funny to prank Mackenzie, so when she gets into the shower he runs to the kitchen and grabs a knife to pretend to replicate the movies penultimate scene. Mackenzie runs off to her room to cry. Seth feels badly, so he decides to apologize. Mackenzie asks why Seth is being such an ass since she thought he liked her.
