We are doing ours at the window where little kids walk by...but we are doing a butcher table with a body, body parts, tons of blood, head sitting in a bucket, etc type look sitting on it. My husband is dressed up kinda like a butcher and is going to be there "hacking" at the body (not looking up at the kids)...when the doorbell rings, he is going to drop to look out the window, grab another knife and walk to the door. You might be able to do a similar type look outside?

Good luck!