Please don’t use your landline or cell phone for this. Get a nice 7-11 burner phone and call from a location far away from your house. If you keep it, turn it off completely before taking it home. The police have way more important things to do than trying to track down a prank caller but I wouldn’t put it past some of them to get a hair up their ass and try to find you if you make enough prank calls. You can always use, “some of them must have left before you got there. I saw tons of cars and people.”