Tell them that Satan beat them to it, give them the crazy eye, close the door and then walk inside shouting profanities and such loud enough that they can hear you outside.
Something like, "No, master. Jehovah's Witnesses don't taste good. Really? All right, I'll invite the next one in."
Something like, "No, master. Jehovah's Witnesses don't taste good. Really? All right, I'll invite the next one in."