I don't know what # you're at but here are some of my favorites:
* Hug them like they're long lost friends. Invite them inside and once they're in the door say "I'm so glad you could make it. The séance and ritual goat sacrifice is going to start in just a minute!"
Another poster - Geordie - reported once seeing them coming. It gave him just enough time to slap a temporary tatoo of a cross - he put it on upside down - on his chest. He's a biker dude and claims to look a bit scary anyway. So when the dubs arrive, he answers his door and has his eyes WIDE WIDE open and says in a deep voice "I'm with the OTHER SIDE". Apparently the dubs ran so fast that their feet weren't touching the sidewalk!
Love, Scully