"A friend of mine hauls out her Book of Common Prayer and tries to convert them to the Episcopal Church (or at least she used to before they got so crazy.)
"
Or you could come to the door, and open it, then say, loudly:
"Hey, honey! Get the sacrificial altar ready. We have company!"
That should send them on their way.
LOL! I need to remember that one for next time the Jehovah's Witnesses show up.
That one may be worth a try.