1. Rent the movie "The Ring" some weekend.
2. Watch it with your wife (or girlfriend) really late at night.
3. When the end credits are still rolling, get up to go to the bathroom.
4. Using your cell phone, call the house phone. When your wife or girlfriend answers, pause for a second, then whisper "ssseven daysss......."
Additional note: In my experience, you may want to move the phone away from your ear to avoid any permanent damage caused by the loud screams of "YOU ASSHOLE!"