Imagine you wake up in the middle of the night and your 16-year-old sister is standing next to your bed staring at you like a zombie. You keep shouting and calling her name, but she doesn't flinch...because she's sleepwalking
Even though you know she's sleepwalking, it's still creepy (and a little funny) because it goes on for almost a minute and it finally ends when the mom comes into the room and wakes the sister up.