You find an old VHS tape, and put it in, to see what it is. It's full of some weird images and you don't recall recording this. After a minute, you see a ringlike nimbus, and the tape stops. You're confused and are about to take the tape out to throw it away or record over it later, when your cell phone/landline rings. You naturally answer it, and a child's voice on the other end says "Seven days" and hangs up.
Do you take the preceedings that occurred in the last couple minutes seriously? What do you do?