"Dirt Devil - The Exorcist"
This ad starts out appearing to be a trailer for a new horror movie based on the Exorcist. A priest comes to a house and is lead up to a room upstairs by a woman as another man in the house prays. When they get upstairs, screams can be heard coming from a room. When the priest enters the room, the bed is empty and a girl is floating on the ceiling. She slides back and forth across the ceiling while the man looks on in terror. It is only then that we learn she is stuck on the ceiling because a woman upstairs from her is using a Dirt Devil vacuum cleaner and is sucking her up there. At the end of the ad, the cord comes unplugged and the girl falls from the ceiling.
You know when it's the devil.